Update Dockerfile

Dockerfile

@@ -11,7 +11,7 @@ ARG VITE_FIREBASE_MESSAGING_SENDER_ID
 ARG VITE_FIREBASE_APP_ID
 ARG VITE_API_BASE_URL
 
-# Set as environment variables so Vite can access them during build
+# Set as environment variables so they're available to the build script
 ENV VITE_FIREBASE_API_KEY=$VITE_FIREBASE_API_KEY
 ENV VITE_FIREBASE_AUTH_DOMAIN=$VITE_FIREBASE_AUTH_DOMAIN
 ENV VITE_FIREBASE_PROJECT_ID=$VITE_FIREBASE_PROJECT_ID
@@ -24,9 +24,15 @@ ENV VITE_API_BASE_URL=$VITE_API_BASE_URL
 COPY frontend/package*.json ./
 RUN npm install
 
-# Copy rest of frontend and build
+# Copy build script and make it executable
+COPY frontend/build-env.sh ./
+RUN chmod +x build-env.sh
+
+# Copy rest of frontend
 COPY frontend/ .
-RUN npm run build
+
+# Create .env file from environment variables and build
+RUN ./build-env.sh && npm run build
 # Vite will output to /frontend/dist by default
 
 # ---------- 2) Backend (FastAPI + Python) ----------