docker size should be 1/4 smaller

.github/workflows/publish-docker.yaml

@@ -10,7 +10,7 @@ env:
   IMAGE_NAME: localgems
 jobs:
   push:
-    runs-on: macos-latest
+    runs-on: ubuntu-latest
     permissions:
       packages: write
       contents: read

Dockerfile

@@ -1,3 +1,18 @@
+FROM node:20 as frontend-builder
+
+WORKDIR /home/app
+
+RUN yarn config set network-timeout 300000
+
+COPY ./frontend/package.json ./frontend/yarn.lock /home/app/frontend/
+
+WORKDIR /home/app/frontend
+RUN NODE_ENV=production yarn install
+
+COPY ./frontend /home/app/frontend/
+RUN yarn build
+
+
 FROM node:20
 
 WORKDIR /home/app
@@ -7,21 +22,15 @@ RUN yarn config set network-timeout 300000
 RUN yarn global add concurrently
 
 COPY ./backend/package.json ./backend/yarn.lock  /home/app/backend/
-COPY ./frontend/package.json ./frontend/yarn.lock /home/app/frontend/
 
 WORKDIR /home/app/backend
-RUN yarn install
-
-WORKDIR /home/app/frontend
-RUN yarn install
+RUN NODE_ENV=production yarn install
 
 WORKDIR /home/app/backend
 COPY ./backend /home/app/backend/
 RUN NODE_ENV=production yarn build
 
-WORKDIR /home/app/frontend
-COPY ./frontend /home/app/frontend/
-RUN yarn build
+COPY --from=frontend-builder /home/app/frontend/.output/server /home/app/frontend/.output/server 
 
 COPY ./entrypoint.sh /home/app/entrypoint.sh