Basic Kubernetes configuration up and running

Add postgres operator and cluster
Create gitlab database declaratively
Update flake
YES, YES, I KNOW THE PASSWORDS ARE DUMB AND WORLD READABLE

manifests/namespaces/db.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: db

manifests/namespaces/kustomization.yaml

@@ -0,0 +1,2 @@
+resources:
+  - db.yaml