ci: Backend CI on PRs; linked CD on push to main (needs: backend_cd)

.github/workflows/CD_linked.yml

@@ -4,7 +4,12 @@ name: CD - Deploy Backend then Frontend to AKS
 on:
   push:
     branches: [ main ]
-
+    paths:
+          - 'k8s/**'
+          - 'backend/**'
+          - 'frontend/**'
+          - '.github/workflows/CD_linked.yml'
+
 permissions:
   id-token: write
   contents: read

.github/workflows/backend_ci.yml

@@ -5,8 +5,11 @@ name: Backend CI - Test, Build and Push Images to ACR
 # Trigger the workflow on pushes to the 'main' branch
 # You can also add 'pull_request:' to run on PRs
 on:
-  # Manual trigger
-  workflow_dispatch:
+  pull_request:
+    branches: [ main ]            # or: [ development ]
+    paths:
+      - 'backend/**'
+      - '.github/workflows/backend_ci.yml'
 
   # Automatically on pushes to main branch
   push:
@@ -111,6 +114,7 @@ jobs:
 
   # Job 2: Build and Push Docker Images (runs only if tests pass)
   build_and_push_images:
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/heads/main')
     runs-on: ubuntu-latest
     needs: test_and_lint_backends
 

.github/workflows/frontend_ci.yml

@@ -3,8 +3,11 @@
 name: Frontend CI - Build & Push Image
 
 on:
-  # Manual trigger
-  workflow_dispatch:
+  pull_request:
+    branches: [ main ]
+    paths:
+      - 'frontend/**'
+      - '.github/workflows/frontend_ci.yml'
 
   # Automatically on pushes to main branch
   push: