add CloudNativePG operator and HA postgres cluster

apps/postgres/cluster.yaml

@@ -0,0 +1,23 @@
+apiVersion: postgresql.cnpg.io/v1
+kind: Cluster
+metadata:
+  name: postgres-cluster
+  namespace: postgres
+spec:
+  instances: 2
+  primaryUpdateStrategy: unsupervised
+
+  enableSuperuserAccess: true
+
+  postgresql:
+    parameters:
+      shared_buffers: "256MB"
+      max_connections: "200"
+
+  storage:
+    size: 10Gi
+    storageClass: hcloud-volumes
+
+  affinity:
+    enablePodAntiAffinity: true
+    topologyKey: kubernetes.io/hostname

apps/postgres/db-watchparty.yaml

@@ -0,0 +1,10 @@
+apiVersion: postgresql.cnpg.io/v1
+kind: Database
+metadata:
+  name: watchparty-db
+  namespace: postgres
+spec:
+  name: watchparty
+  owner: app
+  cluster:
+    name: postgres-cluster