fix: devcontainer build and setup on fresh clones

docker-compose.yml

@@ -12,7 +12,11 @@ services:
       context: ./backend
       dockerfile: Dockerfile
     env_file:
-      - .env
+      # Optional: fresh clones and CI checkouts have no `.env` (gitignored);
+      # containers must still create so `config`/`build` work everywhere.
+      # Runtime secrets come from `.env` when present (see setup.sh).
+      - path: .env
+        required: false
     volumes:
       # No venv volume by design: the venv lives at /opt/venv (image-local,
       # see backend/Dockerfile). A named volume here used to shadow the image
@@ -43,7 +47,11 @@ services:
       context: ./frontend
       dockerfile: Dockerfile
     env_file:
-      - .env
+      # Optional: fresh clones and CI checkouts have no `.env` (gitignored);
+      # containers must still create so `config`/`build` work everywhere.
+      # Runtime secrets come from `.env` when present (see setup.sh).
+      - path: .env
+        required: false
     environment:
       # Dev default (HMR); prod .env sets `preview` (build + serve bundle).
       FRONTEND_MODE: ${FRONTEND_MODE:-dev}
@@ -65,7 +73,11 @@ services:
     # .env.example) together with Dockerfile.lfx + backend `lfx~=` pin.
     image: langflowai/langflow:${LANGFLOW_VERSION:-1.12.0}
     env_file:
-      - .env
+      # Optional: fresh clones and CI checkouts have no `.env` (gitignored);
+      # containers must still create so `config`/`build` work everywhere.
+      # Runtime secrets come from `.env` when present (see setup.sh).
+      - path: .env
+        required: false
     environment:
       # Static values only; secrets/URLs come from .env via env_file.
       LANGFLOW_CONFIG_DIR: /app/langflow
@@ -104,7 +116,11 @@ services:
       context: .
       dockerfile: Dockerfile.lfx
     env_file:
-      - .env
+      # Optional: fresh clones and CI checkouts have no `.env` (gitignored);
+      # containers must still create so `config`/`build` work everywhere.
+      # Runtime secrets come from `.env` when present (see setup.sh).
+      - path: .env
+        required: false
     volumes:
       - lfx-data:/flows
     ports: