Update Dockerfile

Dockerfile

@@ -1,7 +1,12 @@
 FROM node:20
 RUN npm install -g pnpm
-ENV PORT ${PORT:-7860}
-EXPOSE ${PORT}
+
+# Define a default port environment variable, which can be overridden
+ENV PORT 7860
+
+# Expose a fixed port
+EXPOSE 7860
+
 # Create a non-root user
 RUN useradd -m appuser
 
@@ -25,8 +30,5 @@ RUN pnpm install
 # Set permissions for the working directory
 RUN chmod -R 777 /home/appuser/react-video-editor
 
-# Expose the port
-
-
 # Start the application
 CMD ["pnpm", "dev"]