feat: add external-secret for cloud-db-credentials

deploy/overlays/development/services/gateway/external-secret.yaml

@@ -0,0 +1,25 @@
+apiVersion: external-secrets.io/v1beta1
+kind: ExternalSecret
+metadata:
+  name: cloud-db-credentials
+  namespace: cloud-services
+spec:
+  refreshInterval: 1h
+  secretStoreRef:
+    name: vault-backend
+    kind: ClusterSecretStore
+  target:
+    name: cloud-db-credentials
+  data:
+    - secretKey: DB_PASSWORD
+      remoteRef:
+        key: secret/cloud-services/db
+        property: password
+    - secretKey: MONGO_USER
+      remoteRef:
+        key: secret/cloud-services/db
+        property: mongo_user
+    - secretKey: MONGO_PASSWORD
+      remoteRef:
+        key: secret/cloud-services/db
+        property: mongo_password

deploy/overlays/development/services/gateway/kustomization.yaml

@@ -8,3 +8,4 @@ resources:
   - ../../../../base
   - deployment.yaml
   - ingress.yaml
+  - external-secret.yaml