fix(ci): skip release PR after release merge (#331)

Avoid opening another release-please PR when the push was created by merging a release PR.

Author: korniltsev-grafanista

.github/workflows/release-please.yml

@@ -31,6 +31,8 @@ jobs:
           token: ${{ steps.get-github-app-token.outputs.token }}
           config-file: release-please-config.json
           manifest-file: .release-please-manifest.json
+          skip-github-pull-request: >-
+            ${{ contains(github.event.head_commit.message, 'chore(main): release') }}
 
   publish:
     name: Publish Maven artifacts