fix(ci): trigger release workflow via workflow_dispatch from release-please

GitHub Actions does not trigger workflows from tags created by
GITHUB_TOKEN. Add workflow_dispatch trigger to release.yml and a
trigger-release job in release-please.yml that dispatches the release
workflow after a release is created.

Author: us

.github/workflows/release-please.yml

@@ -23,6 +23,22 @@ jobs:
           config-file: release-please-config.json
           manifest-file: .release-please-manifest.json
 
+  trigger-release:
+    needs: release-please
+    if: needs.release-please.outputs.release_created == 'true'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger Release workflow
+        uses: actions/github-script@v7
+        with:
+          script: |
+            await github.rest.actions.createWorkflowDispatch({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              workflow_id: 'release.yml',
+              ref: '${{ needs.release-please.outputs.tag_name }}',
+            });
+
   update-readme:
     needs: release-please
     if: needs.release-please.outputs.release_created == 'true'

.github/workflows/release.yml

@@ -4,6 +4,7 @@ on:
   push:
     tags:
       - 'v*'
+  workflow_dispatch:
 
 env:
   CARGO_TERM_COLOR: always