Update ci-cd.yml

.github/workflows/ci-cd.yml

@@ -1,9 +1,10 @@
 name: CI-CD
 run-name: >-
-  ${{ format('Main deploy: {0}', github.sha) }}
+  ${{ format('Merge PR #{0}: {1}', github.event.pull_request.number, github.event.pull_request.title) }}
 
 on:
-  push:
+  pull_request:
+    types: [closed]
     branches: ["main"]
 
 permissions:
@@ -12,6 +13,7 @@ permissions:
 jobs:
   quality-gate:
     runs-on: ubuntu-latest
+    if: ${{ github.event.pull_request.merged == true }}
     steps:
       - uses: actions/checkout@v4
 
@@ -43,13 +45,15 @@ jobs:
     name: Deploy Gate
     runs-on: ubuntu-latest
     needs: [quality-gate]
+    if: ${{ github.event.pull_request.merged == true }}
     steps:
-      - run: echo "Ready for build/push on main"
+      - run: echo "Ready for build/push on merged PR to main"
 
   build-and-push:
     name: Build and Push Docker
     runs-on: ubuntu-latest
     needs: [deploy-gate]
+    if: ${{ github.event.pull_request.merged == true }}
     permissions:
       contents: read
       packages: write
@@ -69,7 +73,7 @@ jobs:
       - name: Extract version
         id: version
         run: |
-          SHORT_SHA=$(echo ${{ github.sha }} | cut -c1-7)
+          SHORT_SHA=$(echo ${{ github.event.pull_request.merge_commit_sha || github.sha }} | cut -c1-7)
           VERSION="staging-${SHORT_SHA}"
           REGISTRY_IMAGE="ghcr.io/$(echo ${{ github.repository }} | tr '[:upper:]' '[:lower:]')/${{ matrix.service }}"
           echo "version=${VERSION}" >> $GITHUB_OUTPUT