Harden GitHub Actions workflows

- Pin every action ref to a full-length commit SHA with a trailing
  version comment, so floating tags like @v4 can't be re-pointed at
  malicious code.
- Bump outdated actions/checkout@v1 to @v4.3.1 (where present).
- Tag-triggered workflows now check out with fetch-depth: 1 and
  fetch-tags: true so the tag ref is available downstream.
- release-tracker.yml grants contents: write at the job level so the
  default GITHUB_TOKEN can push commits/tags back to the repo.

Signed-off-by: Tamal Saha <tamal@appscode.com>

Author: tamalsaha

.github/workflows/ci.yml

@@ -19,13 +19,13 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Set up Go 1.25
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5.6.0
         with:
           go-version: '1.25'
         id: go
 
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       - name: Prepare Host
         run: |
@@ -63,7 +63,7 @@ jobs:
       matrix:
         k8s: [v1.28.15, v1.30.13, v1.32.5, v1.34.0]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       - name: Install yq
         run: |
@@ -73,7 +73,7 @@ jobs:
 
       - name: Create Kubernetes ${{ matrix.k8s }} cluster
         id: kind
-        uses: engineerd/setup-kind@v0.5.0
+        uses: engineerd/setup-kind@aa272fe2a7309878ffc2a81c56cfe3ef108ae7d0 # v0.5.0
         with:
           version: v0.29.0
           image: kindest/node:${{ matrix.k8s }}

.github/workflows/cve-report.yml

@@ -14,10 +14,10 @@ jobs:
     name: Report
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
     - name: Set up Go
-      uses: actions/setup-go@v5
+      uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5.6.0
       with:
         go-version: '1.25'
 
@@ -61,7 +61,7 @@ jobs:
         git commit -s -a -m "Update cve report $(date --rfc-3339=date)"
 
     - name: Create Pull Request
-      uses: peter-evans/create-pull-request@v6
+      uses: peter-evans/create-pull-request@c5a7806660adbe173f04e3e038b0ccdcd758773c # v6.1.0
       with:
         token: ${{ secrets.LGTM_GITHUB_TOKEN }}
         title: Update cve report

.github/workflows/publish-oci.yml

@@ -16,19 +16,22 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v1
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+        with:
+          fetch-depth: 1
+          fetch-tags: true
 
       - name: Set up QEMU
         id: qemu
-        uses: docker/setup-qemu-action@v3
+        uses: docker/setup-qemu-action@c7c53464625b32c7a7e944ae62b3e17d2b600130 # v3.7.0
         with:
           cache-image: false
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3.12.0
 
       - name: Log in to the GitHub Container registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@c94ce9fb468520275223c153574b00df6fe4bcc9 # v3.7.0
         with:
           registry: ghcr.io
           username: 1gtm

.github/workflows/release-tracker.yml

@@ -12,9 +12,11 @@ concurrency:
 jobs:
   build:
     runs-on: ubuntu-24.04
+    permissions:
+      contents: write
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       - name: Prepare git
         env:

.github/workflows/release.yml

@@ -16,7 +16,10 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v1
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+        with:
+          fetch-depth: 1
+          fetch-tags: true
 
       - name: Install GitHub CLI
         run: |