Add readiness probe to prompt pub.

Author: dspeck1

applications/prompt-pub/templates/statefulset.yaml

@@ -71,6 +71,11 @@ spec:
               value: "0"
             - name: AWS_REQUEST_CHECKSUM_CALCULATION
               value: WHEN_REQUIRED
+          readinessProbe:
+            tcpSocket:
+              port: 5432
+            initialDelaySeconds: 2
+            periodSeconds: 5
           volumeMounts:
             - name: gcp-int-repo-config-volume
               mountPath: /opt/lsst/configs/gcp-repo-path