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/background-deployment.yaml

@@ -43,6 +43,7 @@ spec:
       #     - name: my-ca-cert-volume
       #       mountPath: /etc/ssl/certs/custom-ca.crt
       #       subPath: my-ca.crt
+
       # Optional volume for CA certificate
       # volumes:
       #   - name: my-cas-cert-volume
@@ -51,3 +52,13 @@ spec:
       #       items:
       #         - key: my-ca.crt
       #           path: my-ca.crt
+
+      # 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