PPHA-369: Add merged event to build stage of pr workflow

Author: Themitchell

.github/workflows/cicd-1-pull-request.yaml

@@ -3,8 +3,11 @@ name: "CI/CD pull request"
 # The total recommended execution time for the "CI/CD Pull Request" workflow is around 20 minutes.
 
 on:
+  push:
+    branches:
+      - "**"
   pull_request:
-    types: [opened, reopened]
+    types: [opened, reopened, merged]
 
 jobs:
   metadata:
@@ -93,7 +96,7 @@ jobs:
     name: "Build stage"
     needs: [metadata, test-stage]
     uses: ./.github/workflows/stage-3-build.yaml
-    if: needs.metadata.outputs.does_pull_request_exist == 'true' || (github.event_name == 'pull_request' && (github.event.action == 'opened' || github.event.action == 'reopened'))
+    if: needs.metadata.outputs.does_pull_request_exist == 'true' || (github.event_name == 'pull_request' && (github.event.action == 'opened' || github.event.action == 'reopened' || github.event.action == 'merged'))
     with:
       build_datetime: "${{ needs.metadata.outputs.build_datetime }}"
       build_timestamp: "${{ needs.metadata.outputs.build_timestamp }}"