feat(ci): auto release PR on push to main

Replace tag-triggered workflow with release-plz style automation:
- Push to main → git-cliff detects next version → release PR created
- Merge release PR → tag + GitHub Release published
- Add bump rules to cliff.toml for version detection

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: crrow

.github/workflows/release.yml

@@ -2,146 +2,129 @@ name: Release
 
 on:
   push:
-    branches:
-      - main
-    tags:
-      - "v[0-9]*"
+    branches: [main]
 
 permissions:
   contents: write
   pull-requests: write
 
 jobs:
-  prepare-release-pr:
-    name: Prepare release PR
-    if: startsWith(github.ref, 'refs/tags/')
+  release-pr:
+    name: Create or update release PR
     runs-on: ubuntu-latest
+    # Skip release commits to avoid infinite loops
+    if: "!startsWith(github.event.head_commit.message, 'chore(release):')"
     steps:
-      - name: Extract version from tag
-        id: version
-        run: |
-          TAG="${GITHUB_REF#refs/tags/}"
-          VERSION="${TAG#v}"
-          echo "tag=$TAG" >> $GITHUB_OUTPUT
-          echo "version=$VERSION" >> $GITHUB_OUTPUT
-
       - name: Checkout
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
+      - name: Determine next version
+        id: next
+        run: |
+          set -euo pipefail
+
+          # Get current version from version.go
+          CURRENT=$(sed -n 's/^const Version = "\(.*\)"/\1/p' version.go)
+          echo "current=$CURRENT" >> $GITHUB_OUTPUT
+
+          # Use git-cliff to calculate the bumped version
+          pip install git-cliff >/dev/null 2>&1 || true
+          NEXT=$(git cliff --bumped-version 2>/dev/null | sed 's/^v//')
+
+          if [ -z "$NEXT" ] || [ "$NEXT" = "$CURRENT" ]; then
+            echo "No version bump needed"
+            echo "bump=false" >> $GITHUB_OUTPUT
+            exit 0
+          fi
+
+          echo "version=$NEXT" >> $GITHUB_OUTPUT
+          echo "tag=v$NEXT" >> $GITHUB_OUTPUT
+          echo "bump=true" >> $GITHUB_OUTPUT
+          echo "Bumping $CURRENT -> $NEXT"
+
       - name: Update version.go
+        if: steps.next.outputs.bump == 'true'
         run: |
-          VERSION="${{ steps.version.outputs.version }}"
+          VERSION="${{ steps.next.outputs.version }}"
           sed -i "s/const Version = \".*\"/const Version = \"$VERSION\"/" version.go
 
       - name: Generate changelog
+        if: steps.next.outputs.bump == 'true'
         uses: orhun/git-cliff-action@v4
         with:
           config: cliff.toml
-          args: --tag ${{ steps.version.outputs.tag }}
+          args: --tag ${{ steps.next.outputs.tag }}
         env:
           OUTPUT: CHANGELOG.md
 
-      - name: Check for modifications
-        id: changes
-        run: |
-          if git diff --quiet; then
-            echo "changes=false" >> $GITHUB_OUTPUT
-          else
-            echo "changes=true" >> $GITHUB_OUTPUT
-          fi
-
       - name: Create release PR
-        if: steps.changes.outputs.changes == 'true'
+        if: steps.next.outputs.bump == 'true'
         uses: peter-evans/create-pull-request@v6
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           base: main
-          commit-message: "chore(release): bump version to ${{ steps.version.outputs.version }}"
-          branch: release/${{ steps.version.outputs.tag }}
-          title: "chore(release): ${{ steps.version.outputs.tag }}"
+          commit-message: "chore(release): bump version to ${{ steps.next.outputs.version }}"
+          branch: release/next
+          title: "chore(release): v${{ steps.next.outputs.version }}"
           body: |
-            ## Release `${{ steps.version.outputs.tag }}`
+            ## Release `v${{ steps.next.outputs.version }}`
 
-            Automated release preparation triggered by tag push.
+            Automated release preparation.
 
             ### Changes
-            - Update `version.go` to `${{ steps.version.outputs.version }}`
+            - Update `version.go` to `${{ steps.next.outputs.version }}`
             - Refresh `CHANGELOG.md`
 
-            ### What happens after merge?
-            Merging this PR will automatically:
-            1. Create a GitHub Release for `${{ steps.version.outputs.tag }}`
-            2. Update the release tag to point to the merge commit
+            ### After merge
+            A GitHub Release with tag `v${{ steps.next.outputs.version }}` will be created automatically.
           add-paths: |
             version.go
             CHANGELOG.md
           labels: release
 
   publish-release:
     name: Publish GitHub release
-    if: github.ref == 'refs/heads/main'
     runs-on: ubuntu-latest
+    # Only run on release commits (merged release PR)
+    if: startsWith(github.event.head_commit.message, 'chore(release):')
     steps:
       - name: Checkout
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
-      - name: Detect release commit
+      - name: Extract version
         id: release
         run: |
           set -euo pipefail
-          BEFORE="${{ github.event.before }}"
-          AFTER="${{ github.sha }}"
-          if [ -z "$BEFORE" ] || [ "$BEFORE" = "0000000000000000000000000000000000000000" ]; then
-            BEFORE="$(git rev-parse "${AFTER}^" 2>/dev/null || echo "")"
-          fi
-
-          if [ -z "$BEFORE" ]; then
-            echo "run=false" >> $GITHUB_OUTPUT
-            exit 0
-          fi
-
-          if git diff --quiet "$BEFORE" "$AFTER" -- version.go; then
-            echo "run=false" >> $GITHUB_OUTPUT
-            exit 0
-          fi
-
           VERSION=$(sed -n 's/^const Version = "\(.*\)"/\1/p' version.go)
           if [ -z "$VERSION" ]; then
-            echo "Unable to determine version from version.go" >&2
+            echo "Unable to determine version" >&2
             exit 1
           fi
-
-          echo "run=true" >> $GITHUB_OUTPUT
           echo "version=$VERSION" >> $GITHUB_OUTPUT
           echo "tag=v$VERSION" >> $GITHUB_OUTPUT
 
       - name: Configure git
-        if: steps.release.outputs.run == 'true'
         run: |
           git config user.name "github-actions[bot]"
           git config user.email "github-actions[bot]@users.noreply.github.com"
 
-      - name: Update release tag
-        if: steps.release.outputs.run == 'true'
+      - name: Create and push tag
         run: |
           TAG="${{ steps.release.outputs.tag }}"
-          git fetch origin --tags
-          git tag -a "$TAG" -f -m "Release $TAG"
-          git push origin "$TAG" --force
+          git tag -a "$TAG" -m "Release $TAG"
+          git push origin "$TAG"
 
       - name: Get previous tag
-        if: steps.release.outputs.run == 'true'
         id: prev_tag
         run: |
           PREV_TAG=$(git describe --tags --abbrev=0 HEAD^ 2>/dev/null || echo "")
           echo "tag=$PREV_TAG" >> $GITHUB_OUTPUT
 
-      - name: Generate changelog
-        if: steps.release.outputs.run == 'true'
+      - name: Generate release notes
         id: changelog
         uses: orhun/git-cliff-action@v4
         with:
@@ -152,13 +135,12 @@ jobs:
           OUTPUT: /tmp/RELEASE_CHANGELOG.md
 
       - name: Create GitHub Release
-        if: steps.release.outputs.run == 'true'
         uses: softprops/action-gh-release@v2
         with:
           tag_name: ${{ steps.release.outputs.tag }}
           body: ${{ steps.changelog.outputs.content }}
           draft: false
-          prerelease: ${{ contains(steps.release.outputs.tag, '-alpha') || contains(steps.release.outputs.tag, '-beta') || contains(steps.release.outputs.tag, '-rc') }}
+          prerelease: false
           generate_release_notes: false
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

cliff.toml

@@ -42,6 +42,11 @@ commit_parsers = [
     { message = "^chore|^ci", group = "⚙️ Miscellaneous" },
     { message = "^revert", group = "◀️ Revert" },
 ]
+# Bump rules for automatic version detection
+[bump]
+features_always_bump_minor = true
+breaking_always_bump_major = true
+
 protect_breaking_commits = false
 filter_commits = false
 topo_order = false