Update Copilot instructions for winget release process and add publish-to-winget skill documentation

.github/copilot-instructions.md

@@ -34,7 +34,7 @@ To create a new plugin:
 
 - **Commit messages:** Clear, succinct, and reference the issue they close when applicable
 - **Versioning:** We follow semver. Use the `upgrade-devproxy-version` skill for version bumps
-- **Release:** After release builds, homebrew and winget are updated manually
+- **Release:** After release builds, homebrew is updated manually. Use the `publish-to-winget` skill for winget submissions
 
 ## Testing Code Changes
 

.github/skills/publish-to-winget/SKILL.md

@@ -0,0 +1,224 @@
+---
+name: publish-to-winget
+description: >
+  This skill should be used when the user asks to "publish to winget",
+  "update winget", "submit to winget", "winget release", "create winget PR",
+  or mentions publishing Dev Proxy to the Windows Package Manager.
+  Handles creating manifest files, computing installer hashes, and submitting
+  a pull request to the winget-pkgs repository.
+---
+
+# Publish Dev Proxy to Winget
+
+Create winget manifest files and submit a PR to `microsoft/winget-pkgs` — entirely via the GitHub API. No local clone of winget-pkgs required.
+
+## Prerequisites
+
+Before starting, verify ALL of the following:
+
+1. **`gh` CLI** is installed and authenticated (`gh auth status`)
+2. **The installer** `.exe` is already published at the GitHub Releases URL for the target version
+
+If any prerequisite fails, stop and tell the user what's missing.
+
+## Input
+
+Ask the user for the **version string** if not provided. Format: `X.Y.Z` or `X.Y.Z-beta.N`.
+
+Validate with pattern: `^(\d+)\.(\d+)\.(\d+)(-beta\.\d+)?$`
+
+## Constants
+
+```
+UPSTREAM_REPO = microsoft/winget-pkgs
+GITHUB_RELEASE_URL = https://github.com/dotnet/dev-proxy/releases/download/v
+MANIFEST_SCHEMA_URL = https://aka.ms/winget-manifest
+MANIFEST_VERSION = 1.12.0
+```
+
+> **Keeping the schema version current:** The `MANIFEST_VERSION` must match the
+> latest schema version used in [winget-pkgs](https://github.com/microsoft/winget-pkgs/tree/master/doc/manifest/schema).
+> Check before publishing — if a newer schema exists, update
+> `MANIFEST_VERSION` here and in the helper script.
+
+## Process
+
+### Step 1: Determine Release Type
+
+Parse the version string to determine if this is a beta release:
+
+| Condition | `releaseFolder` | `packageIdentifier` | `packageName` |
+|-----------|-----------------|---------------------|---------------|
+| Version contains `beta` | `DevProxy/Beta` | `DevProxy.DevProxy.Beta` | `Dev Proxy Beta` |
+| Otherwise | `DevProxy` | `DevProxy.DevProxy` | `Dev Proxy` |
+
+### Step 2: Ensure Fork Exists
+
+```bash
+gh repo fork microsoft/winget-pkgs --clone=false
+```
+
+Determine the fork name (the authenticated user's fork):
+
+```bash
+FORK_REPO=$(gh api user --jq '.login')/winget-pkgs
+```
+
+### Step 3: Download Installer and Compute SHA256
+
+Download the installer and compute its SHA256 hash:
+
+```bash
+curl -sL "${GITHUB_RELEASE_URL}<version>/dev-proxy-installer-win-x64-v<version>.exe" | shasum -a 256 | awk '{print $1}'
+```
+
+If the download fails (404 or empty hash), stop and tell the user the installer is not available at that URL. The SHA256 of an empty file is `e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855` — treat this as a failure.
+
+### Step 4: Get Upstream master HEAD SHA
+
+```bash
+MASTER_SHA=$(gh api repos/microsoft/winget-pkgs/git/ref/heads/master --jq '.object.sha')
+```
+
+### Step 5: Create Branch on Fork
+
+Branch name format: `microsoft-devproxy-X-Y-Z` (dots replaced with dashes).
+
+```bash
+gh api repos/${FORK_REPO}/git/refs -f ref="refs/heads/<branch-name>" -f sha="${MASTER_SHA}"
+```
+
+If the branch already exists (422 error), update it instead:
+
+```bash
+gh api repos/${FORK_REPO}/git/refs/heads/<branch-name> -X PATCH -f sha="${MASTER_SHA}" -f force=true
+```
+
+### Step 6: Create Manifest Files via Git Data API
+
+Build the manifest file content, then commit all three files in a single commit using the Git Data API.
+
+The manifest path prefix is: `manifests/d/DevProxy/<releaseFolder>/<version>/`
+
+**6a: Create blobs** for each file:
+
+```bash
+BLOB_SHA=$(gh api repos/${FORK_REPO}/git/blobs -f content="<file-content>" -f encoding="utf-8" --jq '.sha')
+```
+
+Create one blob per manifest file (3 total).
+
+**6b: Create tree** with all three files:
+
+```bash
+gh api repos/${FORK_REPO}/git/trees \
+  -f "base_tree=${MASTER_SHA}" \
+  -f "tree[][path]=manifests/d/DevProxy/<releaseFolder>/<version>/<packageIdentifier>.installer.yaml" \
+  -f "tree[][mode]=100644" \
+  -f "tree[][type]=blob" \
+  -f "tree[][sha]=<installer-blob-sha>" \
+  -f "tree[][path]=manifests/d/DevProxy/<releaseFolder>/<version>/<packageIdentifier>.locale.en-US.yaml" \
+  -f "tree[][mode]=100644" \
+  -f "tree[][type]=blob" \
+  -f "tree[][sha]=<locale-blob-sha>" \
+  -f "tree[][path]=manifests/d/DevProxy/<releaseFolder>/<version>/<packageIdentifier>.yaml" \
+  -f "tree[][mode]=100644" \
+  -f "tree[][type]=blob" \
+  -f "tree[][sha]=<version-blob-sha>"
+```
+
+**6c: Create commit**:
+
+```bash
+COMMIT_SHA=$(gh api repos/${FORK_REPO}/git/commits \
+  -f message="New version: <packageIdentifier> version <version>" \
+  -f "tree=<tree-sha>" \
+  -f "parents[]=${MASTER_SHA}" \
+  --jq '.sha')
+```
+
+**6d: Update branch ref**:
+
+```bash
+gh api repos/${FORK_REPO}/git/refs/heads/<branch-name> -X PATCH -f sha="${COMMIT_SHA}"
+```
+
+### Manifest File Content
+
+Use the exact content below, substituting variables.
+
+**File: `<packageIdentifier>.installer.yaml`**
+
+```yaml
+# yaml-language-server: $schema=https://aka.ms/winget-manifest.installer.<MANIFEST_VERSION>.schema.json
+
+PackageIdentifier: <packageIdentifier>
+PackageVersion: <version>
+InstallerType: inno
+Installers:
+ - InstallerUrl: https://github.com/dotnet/dev-proxy/releases/download/v<version>/dev-proxy-installer-win-x64-v<version>.exe
+   Architecture: x64
+   InstallerSha256: <sha256-hash>
+ManifestType: installer
+ManifestVersion: <MANIFEST_VERSION>
+```
+
+**File: `<packageIdentifier>.locale.en-US.yaml`**
+
+```yaml
+# yaml-language-server: $schema=https://aka.ms/winget-manifest.defaultLocale.<MANIFEST_VERSION>.schema.json
+
+PackageIdentifier: <packageIdentifier>
+PackageVersion: <version>
+PackageLocale: en-US
+Publisher: .NET Foundation
+PackageName: <packageName>
+License: MIT License
+ShortDescription: <shortDescription>
+ManifestType: defaultLocale
+ManifestVersion: <MANIFEST_VERSION>
+```
+
+> **ShortDescription rules:** Must be 3–256 characters. Must NOT be just
+> "package name installer" or "package name setup". Use a real description.
+>
+> | Release type | `shortDescription` |
+> |-------------|---------------------|
+> | Stable | `Dev Proxy is a command line tool for simulating APIs for testing apps` |
+> | Beta | `Dev Proxy Beta is a preview build of the command line tool for simulating APIs for testing apps` |
+
+**File: `<packageIdentifier>.yaml`**
+
+```yaml
+# yaml-language-server: $schema=https://aka.ms/winget-manifest.version.<MANIFEST_VERSION>.schema.json
+
+PackageIdentifier: <packageIdentifier>
+PackageVersion: <version>
+DefaultLocale: en-US
+ManifestType: version
+ManifestVersion: <MANIFEST_VERSION>
+```
+
+### Step 7: Create Pull Request
+
+```bash
+gh pr create \
+  --repo microsoft/winget-pkgs \
+  --head "${FORK_REPO##*/}:<branch-name>" \
+  --base master \
+  --title "New version: <packageIdentifier> version <version>" \
+  --body "New version: <packageIdentifier> version <version>"
+```
+
+Show the user the PR URL when done.
+
+## Troubleshooting
+
+| Problem | Solution |
+|---------|----------|
+| `gh` not found | Install with `brew install gh` then `gh auth login` |
+| `gh auth` not logged in | Run `gh auth login` |
+| Installer 404 | Verify the release exists at `https://github.com/dotnet/dev-proxy/releases/tag/v<version>` |
+| Empty SHA256 hash | The curl download failed — check the URL and your network |
+| Branch already exists (422) | The script handles this by force-updating the existing branch |
+| Fork already exists | `gh repo fork` is idempotent — safe to re-run |