CI: Enable workflow "Release: Application bundle"

Author: amotl

.github/workflows/release-app.yml

@@ -11,7 +11,7 @@ on:
       - '*'
 
   # Build application on each pull request for validation purposes.
-  # pull_request:
+  pull_request:
 
   # Build application each night for validation purposes.
   # schedule:
@@ -20,6 +20,10 @@ on:
   # Allow the job to be triggered manually.
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
 
   build: