feat(Nextcloud): Split redis & postgres configuration

nextcloud/docker-compose.postgres.yml

@@ -0,0 +1,18 @@
+---
+
+version: "3.8"
+
+services:
+  nextcloud-fpm:
+    depends_on:
+      - postgres
+    environment:
+      &postgres-configuration
+      POSTGRES_HOST: ${POSTGRES_CONTAINER_NAME:-postgres} # Default name is same as ../postgres/docker-compose.yml:8
+      POSTGRES_USER: ${POSTGRES_USER:?err}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?err}
+      POSTGRES_DB: ${POSTGRES_DB:?err}
+
+  nextcloud-cron:
+    environment:
+      <<: *postgres-configuration