deploy encapi to au-syd1

encapi is the new Postgres-backed Puppet ENC replacing Cobbler. Stand it up in
k8s alongside artifactapi so the puppet masters (via encapi-cli classify) and
the enc_direct_facts fact can reach it at encapi.k8s.syd1.au.unkin.net.

- add apps/base/encapi: namespace, deployment (git.unkin.net/unkin/encapi), service,
  gateway + httproute (encapi.k8s.syd1.au.unkin.net), configmap, CNPG cluster +
  pooler (db encapi), VaultAuth + VaultStaticSecrets (postgres-credentials, environment)
- add apps/overlays/au-syd1/encapi overlay
- register apps/overlays/*/encapi in the platform ApplicationSet

Note: the Vault KV secrets kv/kubernetes/namespace/encapi/default/{postgres-credentials,
environment} must be seeded before first sync; 'environment' carries DBPASS (matching
the CNPG owner password) and ENCAPI_WRITE_TOKEN.

apps/base/encapi/httproute.yaml

@@ -0,0 +1,49 @@
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: encapi-http-redirect
+  namespace: encapi
+spec:
+  hostnames:
+    - encapi.k8s.syd1.au.unkin.net
+  parentRefs:
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: encapi
+      sectionName: http
+  rules:
+    - filters:
+        - type: RequestRedirect
+          requestRedirect:
+            scheme: https
+            statusCode: 301
+      matches:
+        - path:
+            type: PathPrefix
+            value: /
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: encapi
+  namespace: encapi
+spec:
+  hostnames:
+    - encapi.k8s.syd1.au.unkin.net
+  parentRefs:
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: encapi
+      sectionName: https
+  rules:
+    - backendRefs:
+        - group: ""
+          kind: Service
+          name: encapi
+          port: 80
+          weight: 1
+      matches:
+        - path:
+            type: PathPrefix
+            value: /