feat: initial puppet deployment

working towards a larger, redundant, autoscaling and simple puppet
implementation in kubernetes. this was originally based on the openvox
helm chart with several improvements (not all in this pr)

- use of cnpg instead of single bitnamilegacy postgres container
- use for g10k instead of r10k
- run one instance of g10k per namespace, instead of per-pod
- store only keep one copy of the environments/branches (instead of per-pod)
- change g10k to native cronjob instead of hacky implementation
- use vault secrets

part one adds:

- cnpg puppetdb pgsql cluster
- cnpg puppetdb pgpooler
- persistent volume claims for puppet, puppetdb, the code repository, etc

apps/base/puppet/cnpg_pooler.yaml

@@ -0,0 +1,33 @@
+---
+apiVersion: postgresql.cnpg.io/v1
+kind: Pooler
+metadata:
+  name: puppet-postgres-pooler
+  namespace: puppet
+spec:
+  cluster:
+    name: puppet-postgres
+  instances: 2
+  pgbouncer:
+    parameters:
+      default_pool_size: "20"
+      max_client_conn: "100"
+    paused: false
+    poolMode: session
+  template:
+    metadata:
+      labels:
+        app: pooler
+    spec:
+      affinity:
+        podAntiAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            - labelSelector:
+                matchExpressions:
+                  - key: app
+                    operator: In
+                    values:
+                      - pooler
+              topologyKey: kubernetes.io/hostname
+      containers: []
+  type: rw