Revert triggering of workflow on workflow_dispatch event

.github/workflows/merge.yml

@@ -1,20 +1,12 @@
 name: Merge
 run-name: Starting release for ${{ github.actor }} PR merge
-#on:
- # pull_request:
-  #  types:
-   #   - closed
-   # branches:
-      # Test branch for testing the merge workflow, will be changed to develop
-    #  - feature/test-automated-release
-# Use the workflow_dispatch event for testing the changes
 on:
-  workflow_dispatch:
-    inputs:
-      release-type:
-        description: 'Release type'
-        required: true
-        default: 'minor'
+  pull_request:
+    types:
+      - closed
+    branches:
+      # Test branch for testing the merge workflow, will be changed to develop
+      - feature/test-automated-release
 
 jobs:
   if_merged: