Automate release workflow

.github/workflows/release.yaml

@@ -0,0 +1,63 @@
+name: Release Chart
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'New version (e.g. 1.2.3). If omitted, bumps based on changelog.'
+        required: false
+        type: string
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Configure Git
+        run: |
+          git config user.name "$GITHUB_ACTOR"
+          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
+
+      - name: Install Helm
+        uses: azure/setup-helm@v4
+        with:
+          version: v3.12.1
+
+      - name: Bump Version
+        run: make bump-version VERSION="${{ inputs.version }}"
+
+      - name: Get New Version
+        id: version
+        run: |
+          new_version=$(grep '^version:' Chart.yaml | awk '{print $2}')
+          echo "new_version=$new_version" >> $GITHUB_OUTPUT
+
+      - name: Update README
+        run: make README.md
+
+      - name: Package Chart
+        run: |
+          helm dependency build
+          helm package . -d docs
+          helm repo index ./docs/ --url https://cortexproject.github.io/cortex-helm-chart
+
+      - name: Create Pull Request
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          git checkout -b release-${{ steps.version.outputs.new_version }}
+          git add Chart.yaml README.md CHANGELOG.md docs/
+          git commit -s -m "Release ${{ steps.version.outputs.new_version }}"
+          git push origin release-${{ steps.version.outputs.new_version }}
+          gh pr create --title "Release ${{ steps.version.outputs.new_version }}" \
+            --body "Automated release PR for version ${{ steps.version.outputs.new_version }}" \
+            --base ${{ github.ref_name }} \
+            --head release-${{ steps.version.outputs.new_version }}

Makefile

@@ -1,3 +1,7 @@
 .PHONY: README.md
 README.md:
 	docker run --rm --volume "$(shell pwd):/helm-docs" -u $(shell id -u) jnorwood/helm-docs:v1.11.0
+
+.PHONY: bump-version
+bump-version:
+	./tools/bump-version.sh $(VERSION)

tools/bump-version.sh

@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+VERSION="${1:-}"
+
+current_version=$(grep '^version:' Chart.yaml | awk '{print $2}')
+echo "Current version: $current_version"
+
+if [ -n "$VERSION" ]; then
+    new_version="$VERSION"
+else
+    unreleased_changes=$(awk '/^## master \/ unreleased/{flag=1; next} /^## /{flag=0} flag' CHANGELOG.md)
+    echo "Unreleased changes analysis:"
+    echo "$unreleased_changes"
+
+    if echo "$unreleased_changes" | grep -q "\[CHANGE\]"; then
+        echo "Found [CHANGE], applying major bump."
+        bump="major"
+    elif echo "$unreleased_changes" | grep -q "\[ENHANCEMENT\]"; then
+        echo "Found [ENHANCEMENT], applying minor bump."
+        bump="minor"
+    else
+        echo "Defaulting to patch bump ([BUGFIX], [DEPENDENCY], or other)."
+        bump="patch"
+    fi
+
+    IFS='.' read -r -a parts <<< "$current_version"
+    major="${parts[0]}"
+    minor="${parts[1]}"
+    patch="${parts[2]}"
+
+    case "$bump" in
+        major) major=$((major + 1)); minor=0; patch=0 ;;
+        minor) minor=$((minor + 1)); patch=0 ;;
+        patch) patch=$((patch + 1)) ;;
+    esac
+    new_version="$major.$minor.$patch"
+fi
+
+echo "New version: $new_version"
+
+# Update Chart.yaml
+# Using temp file for portability
+sed "s/^version: .*/version: $new_version/" Chart.yaml > Chart.yaml.tmp && mv Chart.yaml.tmp Chart.yaml
+
+# Update Changelog
+date_str=$(date +%Y-%m-%d)
+# Use perl for consistent behavior across platforms (macOS/Linux) regarding newlines in replacement
+perl -i -pe "s/^## master \/ unreleased/## master \/ unreleased\n\n## $new_version \/ $date_str/" CHANGELOG.md
+
+echo "Successfully bumped version to $new_version"