disable auto changelog PR on merge (#298)

.github/workflows/push.yml

@@ -10,17 +10,8 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 
-on:  # yamllint disable-line rule:truthy
-  push:
-    # branches to consider in the event; optional, defaults to all
-    branches:
-      - main
-      - 'releases/**'
-      - 'stable/**'
-    # Prevent a 2nd run after the changelog is updated
-    paths-ignore:
-      - CHANGELOG.rst
-      - changelogs/changelog.yaml
+
+on:
   workflow_dispatch:
 
 env: