Add release workflow for automated plugin deployment

Author: hnavidan

.github/workflows/release.yml

@@ -0,0 +1,21 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release:
+    permissions:
+      id-token: write
+      contents: write
+      attestations: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: grafana/plugin-actions/build-plugin@main
+        with:
+          policy_token: ${{ secrets.GRAFANA_ACCESS_POLICY_TOKEN }}
+          attestation: true