Make notifcations integration test run conditional on code change detection in upstream job

This saves some container dependencies being created as the job won't be started unless the unit test suite is successful and there are detected code changes.

Author: steventux

.github/workflows/stage-2-test.yaml

@@ -37,6 +37,8 @@ jobs:
     name: 'Tests'
     runs-on: ubuntu-latest
     timeout-minutes: 5
+    outputs:
+      notifications-changed: ${{ steps.notifications-changes-result.outputs.changed }}
 
     services:
       postgres:
@@ -55,6 +57,19 @@ jobs:
       - name: 'Checkout code'
         uses: actions/checkout@v5
 
+      - name: Detect notifications code changes
+        uses: dorny/paths-filter@v3
+        id: notifications-changes
+        with:
+          filters: |
+            notifications:
+              - 'manage_breast_screening/notifications/**'
+
+      - name: Store notification code changes check
+        id: notification-changes-result
+        if: steps.notifications-changes.outputs.notifications == 'true'
+        run: echo "changed=true" >> "$GITHUB_OUTPUT"
+
       - name: Install poetry
         run: pipx install poetry
 
@@ -89,6 +104,7 @@ jobs:
 
   notifications-integration-test:
     needs: test
+    if: jobs.test.outputs.notifications-changed == 'true'
     name: 'Notifications Integration Tests'
     runs-on: ubuntu-latest
     timeout-minutes: 5