Separate dockerfile layers and add volume

Dockerfile

@@ -8,9 +8,12 @@ RUN apk add --update --no-cache \
 
 WORKDIR /app
 
-COPY . .
+COPY package*.json ./
 
 RUN npm install
+
+COPY . .
+
 RUN npm run build
 
 EXPOSE 3000

docker-compose.yml

@@ -14,6 +14,7 @@ services:
       - "./plugins:/app/plugins"
       - "./static:/app/static"
       - "./store:/app/store"
+      - "./components:/app/components"
     ports:
       - "3000:3000"
     command: "npm run dev"