chore: add create-release-pr workflow and changelog automation

- Add create-release-pr.yaml workflow with workflow_dispatch for
  patch/minor/major chart version bumps, changelog finalization,
  and automated PR creation
- Update update-sourcebot-version.yaml to add changelog entry
  under [Unreleased] when bumping appVersion

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: brendan-kellam

.github/workflows/create-release-pr.yaml

@@ -0,0 +1,125 @@
+name: Create Release PR
+
+on:
+  workflow_dispatch:
+    inputs:
+      bump_type:
+        description: "Type of version bump to apply"
+        required: true
+        type: choice
+        options:
+          - patch
+          - minor
+          - major
+
+concurrency:
+  group: create-release-pr
+  cancel-in-progress: false
+
+jobs:
+  create-release-pr:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+
+    steps:
+      - name: Generate GitHub App token
+        id: generate_token
+        uses: actions/create-github-app-token@v2
+        with:
+          app-id: ${{ secrets.RELEASE_APP_ID }}
+          private-key: ${{ secrets.RELEASE_APP_PRIVATE_KEY }}
+          owner: sourcebot-dev
+          repositories: sourcebot-helm-chart
+
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          token: ${{ steps.generate_token.outputs.token }}
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+
+      - name: Install semver
+        run: npm install -g semver
+
+      - name: Calculate new version
+        id: calculate_version
+        run: |
+          CURRENT_VERSION=$(grep '^version:' charts/sourcebot/Chart.yaml | cut -d ' ' -f 2)
+          echo "Current chart version: $CURRENT_VERSION"
+
+          NEW_VERSION=$(semver -i ${{ inputs.bump_type }} $CURRENT_VERSION)
+          echo "New chart version: $NEW_VERSION"
+
+          echo "current_version=$CURRENT_VERSION" >> $GITHUB_OUTPUT
+          echo "new_version=$NEW_VERSION" >> $GITHUB_OUTPUT
+
+      - name: Check if version already exists
+        run: |
+          VERSION=${{ steps.calculate_version.outputs.new_version }}
+          if grep -q "## \[$VERSION\]" CHANGELOG.md; then
+            echo "Error: Version $VERSION already exists in CHANGELOG.md"
+            exit 1
+          fi
+
+      - name: Update Chart.yaml version
+        run: |
+          sed -i "s/^version: .*/version: ${{ steps.calculate_version.outputs.new_version }}/" charts/sourcebot/Chart.yaml
+
+      - name: Update CHANGELOG.md
+        run: |
+          VERSION=${{ steps.calculate_version.outputs.new_version }}
+          DATE=$(date +%Y-%m-%d)
+
+          # Insert the new version header after the [Unreleased] line
+          sed -i "/## \[Unreleased\]/a\\
+          \\
+          ## [$VERSION] - $DATE" CHANGELOG.md
+
+          echo "Updated CHANGELOG.md with version $VERSION"
+          cat CHANGELOG.md | head -n 20
+
+      - name: Install helm-docs
+        run: |
+          cd /tmp
+          curl -L https://github.com/norwoodj/helm-docs/releases/download/v1.14.2/helm-docs_1.14.2_Linux_x86_64.tar.gz | tar xz
+          sudo mv helm-docs /usr/local/bin/
+
+      - name: Update README.md
+        run: |
+          cd charts/sourcebot
+          helm-docs
+
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v8
+        with:
+          token: ${{ steps.generate_token.outputs.token }}
+          commit-message: |
+            chore: release chart v${{ steps.calculate_version.outputs.new_version }}
+
+            - Bump chart version from ${{ steps.calculate_version.outputs.current_version }} to ${{ steps.calculate_version.outputs.new_version }}
+            - Update CHANGELOG.md
+            - Update generated documentation
+          title: "chore: release chart v${{ steps.calculate_version.outputs.new_version }}"
+          body: |
+            ## Summary
+            Release chart version ${{ steps.calculate_version.outputs.new_version }} (${{ inputs.bump_type }} bump).
+
+            ## Changes
+            - 📦 Bump chart version from ${{ steps.calculate_version.outputs.current_version }} to ${{ steps.calculate_version.outputs.new_version }}
+            - 📝 Update CHANGELOG.md
+            - 📝 Update generated documentation
+
+            ---
+            **Bump type**: `${{ inputs.bump_type }}`
+          branch: release-chart-v${{ steps.calculate_version.outputs.new_version }}
+          delete-branch: true
+          reviewers: |
+            brendan-kellam
+            msukkari
+          labels: |
+            release

.github/workflows/update-sourcebot-version.yaml

@@ -81,6 +81,20 @@ jobs:
           
           echo "chart_version=$NEW_CHART_VERSION" >> $GITHUB_OUTPUT
 
+      - name: Update CHANGELOG.md
+        if: steps.version-check.outputs.needs_update == 'true'
+        run: |
+          LATEST_VERSION=${{ steps.latest-version.outputs.latest }}
+
+          # Add changelog entry under [Unreleased]
+          sed -i "/## \[Unreleased\]/a\\
+          \\
+          ### Changed\\
+          - Bumped Sourcebot to $LATEST_VERSION. [Release notes](https://github.com/sourcebot-dev/sourcebot/releases/tag/$LATEST_VERSION)" CHANGELOG.md
+
+          echo "Updated CHANGELOG.md"
+          cat CHANGELOG.md | head -n 15
+
       - name: Install helm-docs
         if: steps.version-check.outputs.needs_update == 'true'
         run: |