IAM Auth for RDS (#3479)

* k

* functional iam auth

* k

* k

* improve typing

* add deployment options

* cleanup

* quick clean up

* minor cleanup

* additional clarity for db session operations

* nit

* k

* k

* update configs

* docker compose spacing

deployment/kubernetes/api_server-service-deployment.yaml

@@ -60,3 +60,12 @@ spec:
           envFrom:
             - configMapRef:
                 name: env-configmap
+      # Uncomment if you are using IAM auth for Postgres
+      #     volumeMounts:
+      #       - name: bundle-pem
+      #         mountPath: "/app/certs"
+      #         readOnly: true
+      # volumes:
+      #   - name: bundle-pem
+      #     secret:
+      #       secretName: bundle-pem-secret