chore: publish attestations to BCR

.github/workflows/publish.yaml

@@ -0,0 +1,34 @@
+# Publish new releases to Bazel Central Registry.
+name: Publish
+on:
+  # Run the publish workflow after a successful release
+  # Will be triggered from the release.yaml workflow
+  workflow_call:
+    inputs:
+      tag_name:
+        required: true
+        type: string
+    secrets:
+      publish_token:
+        required: true
+  # In case of problems, let release engineers retry by manually dispatching
+  # the workflow from the GitHub UI
+  workflow_dispatch:
+    inputs:
+      tag_name:
+        required: true
+        type: string
+jobs:
+  publish:
+    uses: bazel-contrib/publish-to-bcr/.github/workflows/[email protected]
+    with:
+      tag_name: ${{ inputs.tag_name }}
+      # GitHub repository which is a fork of the upstream where the Pull Request will be opened.
+      registry_fork: aspect-build/bazel-central-registry
+    permissions:
+      attestations: write
+      contents: write
+      id-token: write
+    secrets:
+      # Necessary to push to the BCR fork, and to open a pull request against a registry
+      publish_token: ${{ secrets.BCR_PUBLISH_TOKEN }}

.github/workflows/release.yml

@@ -8,9 +8,22 @@ on:
     tags:
       - "v*.*.*"
 
+permissions:
+  id-token: write
+  attestations: write
+  contents: write
+
 jobs:
   release:
-    uses: bazel-contrib/.github/.github/workflows/release_ruleset.yaml@v6
+    uses: bazel-contrib/.github/.github/workflows/release_ruleset.yaml@v7.2.2
     with:
       release_files: toolchains_protoc-*.tar.gz
       prerelease: false
+      tag_name: ${{ github.ref_name }}
+  publish:
+    needs: release
+    uses: ./.github/workflows/publish.yaml
+    with:
+      tag_name: ${{ github.ref_name }}
+    secrets:
+      publish_token: ${{ secrets.BCR_PUBLISH_TOKEN }}