add release workflow

Author: fenicento

.github/workflows/release.yml

@@ -0,0 +1,73 @@
+name: Build and Release Chart
+
+on:
+  push:
+    tags:
+      - '*'
+  workflow_dispatch:
+    inputs:
+      tag_name:
+        description: 'Tag name for the release (for example: v1.2.0)'
+        required: true
+        type: string
+      ref:
+        description: 'Git ref to build (branch, tag, or commit SHA)'
+        required: false
+        default: 'main'
+        type: string
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Resolve release variables
+        id: vars
+        shell: bash
+        run: |
+          if [ "${GITHUB_EVENT_NAME}" = "push" ]; then
+            echo "tag=${GITHUB_REF_NAME}" >> "$GITHUB_OUTPUT"
+            echo "build_ref=${GITHUB_REF}" >> "$GITHUB_OUTPUT"
+          else
+            echo "tag=${{ inputs.tag_name }}" >> "$GITHUB_OUTPUT"
+            echo "build_ref=${{ inputs.ref }}" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Checkout source
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ steps.vars.outputs.build_ref }}
+
+      - name: Resolve release target commit
+        id: release_target
+        shell: bash
+        run: echo "sha=$(git rev-parse HEAD)" >> "$GITHUB_OUTPUT"
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build bundle
+        run: npm run build
+
+      - name: Ensure chart bundle exists
+        run: test -f lib/index.umd.js
+
+      - name: Create or update GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: ${{ steps.vars.outputs.tag }}
+          target_commitish: ${{ steps.release_target.outputs.sha }}
+          files: |
+            lib/index.umd.js
+          overwrite_files: true
+          generate_release_notes: true
+          make_latest: true