W-010: create releases from version tags

.github/workflows/release.yml

@@ -1,12 +1,12 @@
 name: Release
 
 on:
-  release:
-    types:
-      - published
+  push:
+    tags:
+      - "v*"
 
 permissions:
-  contents: read
+  contents: write
   id-token: write
 
 concurrency:
@@ -27,5 +27,60 @@ jobs:
           registry-url: https://registry.npmjs.org
       - run: pnpm install --frozen-lockfile
       - run: pnpm gate
-      - run: pnpm publish --access public --provenance --no-git-checks
+      - name: Select release metadata
+        id: release
+        run: |
+          version="${GITHUB_REF_NAME#v}"
+          package_version="$(node -p "require('./packages/roller/package.json').version")"
+          if [[ "$version" != "$package_version" ]]; then
+            echo "Tag $GITHUB_REF_NAME does not match package version $package_version" >&2
+            exit 1
+          fi
+          dist_tag="${version#*-}"
+          if [[ "$dist_tag" == "$version" ]]; then
+            dist_tag=latest
+            prerelease=false
+          else
+            dist_tag="${dist_tag%%.*}"
+            prerelease=true
+          fi
+          {
+            printf 'version=%s\n' "$version"
+            printf 'dist_tag=%s\n' "$dist_tag"
+            printf 'prerelease=%s\n' "$prerelease"
+          } >> "$GITHUB_OUTPUT"
+      - name: Create GitHub release
+        env:
+          GH_TOKEN: ${{ github.token }}
+          RELEASE_VERSION: ${{ steps.release.outputs.version }}
+          PRERELEASE: ${{ steps.release.outputs.prerelease }}
+        run: |
+          if gh release view "$GITHUB_REF_NAME" --repo "$GITHUB_REPOSITORY" >/dev/null 2>&1; then
+            echo "GitHub release $GITHUB_REF_NAME already exists"
+            exit 0
+          fi
+          notes="$(awk -v prefix="$RELEASE_VERSION:" '
+            index($0, prefix) == 1 {
+              found = 1
+              sub(/^[^:]+:[[:space:]]*/, "")
+              print
+              next
+            }
+            found && /^[0-9]+\.[0-9]+\.[0-9]+(-[^:]*)?:/ { exit }
+            found { print }
+          ' CHANGELOG.md)"
+          args=(release create "$GITHUB_REF_NAME" --repo "$GITHUB_REPOSITORY" --verify-tag --title "$GITHUB_REF_NAME")
+          if [[ "$PRERELEASE" == true ]]; then
+            args+=(--prerelease)
+          fi
+          if [[ -n "$notes" ]]; then
+            printf '%s\n' "$notes" > "$RUNNER_TEMP/release-notes.md"
+            args+=(--notes-file "$RUNNER_TEMP/release-notes.md")
+          else
+            args+=(--generate-notes)
+          fi
+          gh "${args[@]}"
+      - run: pnpm publish --access public --provenance --no-git-checks --tag "$NPM_DIST_TAG"
+        env:
+          NPM_DIST_TAG: ${{ steps.release.outputs.dist_tag }}
         working-directory: packages/roller

README.md

@@ -84,5 +84,5 @@ installable previews through pkg.pr.new once its GitHub App is installed.
 Run `pnpm gate:docker` to execute the same containerized gate used by CI.
 
 To release, update the version and changelog on `develop`, merge it to `main`,
-tag the release as `vX.Y.Z`, and publish a matching GitHub release. The release
-workflow runs the full gate before publishing to npm with trusted publishing.
+then push the matching `vX.Y.Z` tag. The release workflow runs the full gate,
+creates the GitHub release, and publishes to npm with trusted publishing.