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/databases/postgres-gitlab.yaml

@@ -0,0 +1,21 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: postgres-user-gitlab
+  labels:
+    cnpg.io/reload: "true"
+type: kubernetes.io/basic-auth
+stringData:
+  # Currently this is set to "gitlab"
+  username: gitlab
+  password: gitlab
+---
+apiVersion: postgresql.cnpg.io/v1
+kind: Database
+metadata:
+  name: database-gitlab
+spec:
+  name: gitlab
+  owner: gitlab
+  cluster:
+    name: postgres