Add release workflow

.github/workflows/release.yml

@@ -0,0 +1,22 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - "v*" # Run workflow on version tags, e.g. v1.0.0.
+
+# necessary to create releases
+permissions:
+  contents: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: grafana/plugin-actions/build-plugin@main
+        with:
+          # see https://grafana.com/developers/plugin-tools/publish-a-plugin/sign-a-plugin#generate-an-access-policy-token to generate it
+          # save the value in your repository secrets
+          policy_token: ${{ secrets.GRAFANA_ACCESS_POLICY_TOKEN }}