ci: wait for job-service to be ready before e2e tests

The job-service retries postgres connection on startup. Add a wait step
to ensure it's processing jobs before running tests.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: theothersideofgod

.github/workflows/test-k8s-deployment.yaml

@@ -139,6 +139,19 @@ jobs:
           kubectl wait --for=condition=complete job/constructive-db \
             -n constructive-functions --timeout=180s
 
+      - name: Wait for job-service to be ready
+        run: |
+          echo "Waiting for job-service to start processing jobs..."
+          for i in {1..30}; do
+            if kubectl logs -n constructive-functions -l app=knative-job-service --tail=50 2>/dev/null | grep -q "starting jobs service"; then
+              echo "Job-service is ready!"
+              break
+            fi
+            echo "  Attempt $i/30: job-service not ready yet..."
+            sleep 2
+          done
+          kubectl logs -n constructive-functions -l app=knative-job-service --tail=20
+
       - name: Port-forward postgres and run e2e tests
         env:
           PGHOST: localhost