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/README.md

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+Stands up my personal infrastructure in a Kubernetes environment.
+
+To apply this you need to install kubectl, kustomize, and helm. It can then by applied
+by simply invoking the command:
+
+```bash
+# Working directory is assumed to be the manifests directory
+./apply.sh
+```
+
+Once the basic cluster stuff is setup, you can just apply this directory with
+
+```bash
+kubectl apply -k .
+```