CCM-8044: Only Deploy on Merge Test - Fix workflow dispatch

Author: jamesthompson26-nhs

.github/workflows/pr_closed.yaml

@@ -12,10 +12,26 @@ concurrency:
   cancel-in-progress: false
 
 jobs:
-  deploy-main:
+  check-merge-or-workflow-dispatch:
     runs-on: ubuntu-latest
+    outputs:
+      deploy: ${{ steps.check.outputs.deploy }}
+    steps:
+      - name: Check if PR was merged or workflow is triggered by workflow_dispatch
+        id: check
+        run: |
+          if [[ "${{ github.event_name }}" == "workflow_dispatch" ]]; then
+            echo "deploy=true" >> $GITHUB_OUTPUT
+          elif [[ "${{ github.event_name }}" == "pull_request" && "${{ github.event.pull_request.merged }}" == "true" ]]; then
+            echo "deploy=true" >> $GITHUB_OUTPUT
+          else
+            echo "deploy=false" >> $GITHUB_OUTPUT
+          fi
+
+  deploy-main:
+    needs: check-merge-or-workflow-dispatch
     name: Deploy changes to main in dev AWS account
-    if: github.event_name == 'workflow_dispatch' || github.event.pull_request.merged == 'true'
+    if: needs.check-merge-or-workflow-dispatch.outputs.deploy == 'true'
 
     permissions:
       id-token: write