fix(k8s): add dev secrets and use emptyDir for postgres on storage-less cluster

infra/k8s/overlays/dev/secrets.yaml

@@ -0,0 +1,10 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: workclub-secrets
+type: Opaque
+stringData:
+  database-connection-string: "Host=workclub-postgres;Database=workclub;Username=app;Password=devpassword"
+  postgres-password: "devpassword"
+  keycloak-db-password: "keycloakpass"
+  keycloak-admin-password: "adminpassword"