simplify the dockerfile and move it to a separate file

Dockerfile

@@ -0,0 +1,4 @@
+FROM node:20-alpine
+WORKDIR /usr/src/app
+COPY . .
+EXPOSE 4000

docker-compose.yml

@@ -1,15 +1,7 @@
 services:
   dev:
-    build:
+    build: .
-      context: .
+    command: npm run start:dev
-      dockerfile_inline: |
-        FROM node:20-alpine
-        WORKDIR /usr/src/app
-        COPY package*.json ./
-        RUN npm install --include=dev
-        COPY . .
-        EXPOSE 4000
-        CMD ["npm", "run", "start:dev"]
     ports:
       - "4000:4000"
     env_file: .env