chore: add an automated GH action for releases (cloudevents#329)

This commits adds the release-please github action to automate the creation of release PR's

This is only for creating GH releases and they automation of publication to npm will come in the future


Signed-off-by: Lucas Holmquist <lholmqui@redhat.com>

Author: lholmquist

.github/workflows/release-please.yml

@@ -0,0 +1,15 @@
+on:
+   push:
+     branches:
+       - main
+name: release-please
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: GoogleCloudPlatform/release-please-action@v2.2.0
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          release-type: node
+          package-name: cloudevents
+          changelog-types: '[{"type":"feat","section":"Features","hidden":false},{"type":"fix","section":"Bug Fixes","hidden":false},{"type":"docs","section":"Documentation","hidden":false},{"type":"chore","section":"Miscellaneous","hidden":false},{"type":"src","section":"Miscellaneous","hidden":false},{"type":"style","section":"Miscellaneous","hidden":false},{"type":"refactor","section":"Miscellaneous","hidden":false},{"type":"perf","section":"Performance","hidden":false},{"type":"test","section":"Tests","hidden":false}]'