Split postgres support into separate compose so that it defaults to sqlite instead

compose.postgres.yml

@@ -0,0 +1,57 @@
+# Compose for PostGres mode instead of the default sqlite mode.
+services:
+  app:
+    environment:
+      - DB_TYPE=postgresdb
+      - DB_POSTGRESDB_HOST=${STACK_NAME}_db
+      - DB_POSTGRESDB_PORT=5432
+      - DB_POSTGRESDB_DATABASE=n8n
+      - DB_POSTGRESDB_USER=root
+      - DB_POSTGRESDB_PASSWORD_FILE=/run/secrets/db_password
+    depends_on:
+      - db
+    secrets:
+      - db_password
+
+  db:
+    image: postgres:16
+    networks:
+      - internal_network
+    environment:
+      - POSTGRES_USER=root
+      - POSTGRES_PASSWORD_FILE=/run/secrets/db_password
+      - POSTGRES_DB=n8n
+    configs:
+      - source: db_entrypoint
+        target: /docker-entrypoint.sh
+        mode: 0555
+    secrets:
+      - db_password
+    healthcheck:
+      test: ["CMD", "pg_isready", "-U", "root", "-d", "n8n"]
+    volumes:
+      - 'postgresql_data:/var/lib/postgresql/data'
+    entrypoint: /docker-entrypoint.sh
+    deploy:
+      labels:
+        backupbot.backup: "true"
+        backupbot.backup.pre-hook: "bash -c 'PGPASSWORD=$$(cat $${POSTGRES_PASSWORD_FILE}) pg_dump -U $${POSTGRES_USER} $${POSTGRES_DB} > /tmp/backup.sql'"
+        backupbot.backup.post-hook: "rm -rf /tmp/backup.sql"
+        backupbot.backup.path: "/tmp/backup.sql"
+
+secrets:
+  # db_non_root_password:
+  #   external: true
+  #   name: ${STACK_NAME}_db_non_root_password_${SECRET_DB_NON_ROOT_PASSWORD_VERSION}
+  db_password:
+    external: true
+    name: ${STACK_NAME}_db_password_${SECRET_DB_PASSWORD_VERSION}
+
+volumes:
+  postgresql_data:
+
+configs:
+  db_entrypoint:
+    name: ${STACK_NAME}_db_entrypoint_${DB_ENTRYPOINT_VERSION}
+    file: entrypoint.postgres.sh.tmpl
+    template_driver: golang