feat: add Docker image publishing

.dockerignore

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+# Git
+.git
+.gitignore
+
+# CI/CD (not needed in image)
+.github/
+.goreleaser.yaml
+.golangci.yml
+justfile
+release-please-config.json
+.release-please-manifest.json
+
+# Documentation
+docs/
+*.md
+
+# Build artifacts
+dist/
+bin/
+coverage.*
+profiles/
+
+# Test data
+testdata/
+
+# Nix
+flake.*
+
+# IDE/Editor
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Claude/AI
+.claude/
+CLAUDE.md
+AGENTS.md
+
+# Demo/examples
+demo.tape
+install.sh

.github/workflows/docker-ci.yml

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+name: Docker CI
+
+on:
+  push:
+    branches: [master]
+    paths:
+      - "Dockerfile"
+      - ".dockerignore"
+      - ".github/workflows/docker-ci.yml"
+      - "**.go"
+      - "go.mod"
+      - "go.sum"
+  pull_request:
+    branches: [master]
+    paths:
+      - "Dockerfile"
+      - ".dockerignore"
+      - ".github/workflows/docker-ci.yml"
+      - "**.go"
+      - "go.mod"
+      - "go.sum"
+
+permissions:
+  contents: read
+  security-events: write
+
+jobs:
+  hadolint:
+    name: Dockerfile Lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Run Hadolint
+        uses: hadolint/hadolint-action@v3.1.0
+        with:
+          dockerfile: Dockerfile
+          failure-threshold: warning
+
+  build-and-scan:
+    name: Build and Scan
+    runs-on: ubuntu-latest
+    needs: hadolint
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Extract metadata
+        id: meta
+        run: |
+          echo "version=$(git describe --tags --always --dirty)" >> $GITHUB_OUTPUT
+          echo "commit=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+          echo "date=$(date -u +%Y-%m-%dT%H:%M:%SZ)" >> $GITHUB_OUTPUT
+
+      - name: Build image for scanning
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: false
+          load: true
+          tags: blobber:ci-${{ github.sha }}
+          build-args: |
+            VERSION=${{ steps.meta.outputs.version }}
+            COMMIT=${{ steps.meta.outputs.commit }}
+            DATE=${{ steps.meta.outputs.date }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Run Trivy vulnerability scanner
+        uses: aquasecurity/trivy-action@0.28.0
+        with:
+          image-ref: blobber:ci-${{ github.sha }}
+          format: sarif
+          output: trivy-results.sarif
+          severity: CRITICAL,HIGH,MEDIUM
+
+      - name: Upload Trivy scan results to GitHub Security
+        uses: github/codeql-action/upload-sarif@v3
+        if: always()
+        with:
+          sarif_file: trivy-results.sarif
+
+      - name: Fail on critical vulnerabilities
+        uses: aquasecurity/trivy-action@0.28.0
+        with:
+          image-ref: blobber:ci-${{ github.sha }}
+          format: table
+          exit-code: "1"
+          severity: CRITICAL,HIGH
+
+      - name: Test image
+        run: |
+          docker run --rm blobber:ci-${{ github.sha }} version
+          docker run --rm blobber:ci-${{ github.sha }} --help

.github/workflows/docker-release.yml

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+name: Docker Release
+
+on:
+  push:
+    tags:
+      - "v*"
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "Tag to release (e.g., v1.0.0)"
+        required: true
+        type: string
+
+permissions:
+  contents: read
+  packages: write
+  id-token: write
+  attestations: write
+
+env:
+  GHCR_IMAGE: ghcr.io/meigma/blobber
+  DOCKERHUB_IMAGE: index.docker.io/meigma/blobber
+
+jobs:
+  build-and-push:
+    name: Build and Push
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          ref: ${{ inputs.tag || github.ref }}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Determine tag
+        id: tag
+        run: |
+          if [ -n "${{ inputs.tag }}" ]; then
+            echo "value=${{ inputs.tag }}" >> $GITHUB_OUTPUT
+          else
+            echo "value=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ${{ env.GHCR_IMAGE }}
+            ${{ env.DOCKERHUB_IMAGE }}
+          tags: |
+            type=semver,pattern={{version}},value=${{ steps.tag.outputs.value }}
+            type=semver,pattern={{major}}.{{minor}},value=${{ steps.tag.outputs.value }}
+            type=semver,pattern={{major}},value=${{ steps.tag.outputs.value }},enable=${{ !startsWith(steps.tag.outputs.value, 'v0.') }}
+            type=sha,prefix=
+            type=raw,value=latest
+
+      - name: Extract version info
+        id: version
+        run: |
+          if [ -n "${{ inputs.tag }}" ]; then
+            VERSION="${{ inputs.tag }}"
+          else
+            VERSION="${GITHUB_REF#refs/tags/}"
+          fi
+          VERSION="${VERSION#v}"
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+          echo "commit=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+          echo "date=$(date -u +%Y-%m-%dT%H:%M:%SZ)" >> $GITHUB_OUTPUT
+
+      - name: Build and push
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            VERSION=${{ steps.version.outputs.version }}
+            COMMIT=${{ steps.version.outputs.commit }}
+            DATE=${{ steps.version.outputs.date }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      # Build provenance attestations
+      - name: Attest GHCR build provenance
+        uses: actions/attest-build-provenance@v2
+        with:
+          subject-name: ${{ env.GHCR_IMAGE }}
+          subject-digest: ${{ steps.build.outputs.digest }}
+          push-to-registry: true
+
+      - name: Attest Docker Hub build provenance
+        uses: actions/attest-build-provenance@v2
+        with:
+          subject-name: ${{ env.DOCKERHUB_IMAGE }}
+          subject-digest: ${{ steps.build.outputs.digest }}
+          push-to-registry: true
+
+      # SBOM generation and attestation
+      - name: Generate SBOM
+        uses: anchore/sbom-action@v0
+        with:
+          image: ${{ env.GHCR_IMAGE }}@${{ steps.build.outputs.digest }}
+          output-file: sbom.spdx.json
+          upload-artifact: false
+
+      - name: Attest GHCR SBOM
+        uses: actions/attest-sbom@v2
+        with:
+          subject-name: ${{ env.GHCR_IMAGE }}
+          subject-digest: ${{ steps.build.outputs.digest }}
+          sbom-path: sbom.spdx.json
+          push-to-registry: true
+
+      - name: Attest Docker Hub SBOM
+        uses: actions/attest-sbom@v2
+        with:
+          subject-name: ${{ env.DOCKERHUB_IMAGE }}
+          subject-digest: ${{ steps.build.outputs.digest }}
+          sbom-path: sbom.spdx.json
+          push-to-registry: true

Dockerfile

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+# syntax=docker/dockerfile:1
+
+# =============================================================================
+# Stage 1: Builder
+# =============================================================================
+FROM golang:1.25-alpine AS builder
+
+# Install git for version info and ca-certificates for HTTPS
+# hadolint ignore=DL3018
+RUN apk add --no-cache git ca-certificates
+
+WORKDIR /build
+
+# Copy dependency files first for better layer caching
+COPY go.mod go.sum ./
+COPY sigstore/go.mod sigstore/go.sum ./sigstore/
+RUN go mod download
+
+# Copy source code
+COPY . .
+
+# Build arguments for version information
+ARG VERSION=dev
+ARG COMMIT=unknown
+ARG DATE=unknown
+
+# Build the binary with security flags
+RUN CGO_ENABLED=0 GOOS=linux go build \
+    -ldflags="-s -w \
+        -X github.com/meigma/blobber/cmd/blobber/cli.version=${VERSION} \
+        -X github.com/meigma/blobber/cmd/blobber/cli.commit=${COMMIT} \
+        -X github.com/meigma/blobber/cmd/blobber/cli.date=${DATE}" \
+    -trimpath \
+    -o /blobber \
+    ./cmd/blobber
+
+# =============================================================================
+# Stage 2: Runtime
+# =============================================================================
+FROM gcr.io/distroless/static-debian12:nonroot
+
+# OCI Image Labels
+# https://github.com/opencontainers/image-spec/blob/main/annotations.md
+LABEL org.opencontainers.image.title="blobber" \
+      org.opencontainers.image.description="Push and pull files to OCI registries" \
+      org.opencontainers.image.url="https://github.com/meigma/blobber" \
+      org.opencontainers.image.source="https://github.com/meigma/blobber" \
+      org.opencontainers.image.documentation="https://blobber.meigma.dev" \
+      org.opencontainers.image.licenses="MIT" \
+      org.opencontainers.image.vendor="Meigma"
+
+# Copy the binary (distroless already includes CA certificates)
+COPY --from=builder /blobber /usr/local/bin/blobber
+
+# nonroot tag already runs as non-root user (65532)
+ENTRYPOINT ["/usr/local/bin/blobber"]