Automates release note generation (#9)

* adds release note generation job in workflow

* uses hypertrace release charts action

Author: JBAhire

.github/workflows/publish.yml

@@ -58,3 +58,13 @@ jobs:
           helm-gcs-credentials: ${{ secrets.HELM_GCS_CREDENTIALS }}
           helm-gcs-repository: ${{ secrets.HELM_GCS_REPOSITORY }}
 
+  publish-release-notes:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/[email protected]
+        with:
+          fetch-depth: 0
+      - uses: hypertrace/github-actions/release-notes@main
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+