Decrease Dockerfile size

.github/workflows/pr-tests.yml

@@ -0,0 +1,31 @@
+name: Check PR
+
+on:
+  pull_request:
+    branches: [ $default-branch ]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install modules
+      run: npm ci
+    - name: Run ESLint
+      run: npm run lint
+
+  tests:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [10.x, 12.x, 14.x, 15.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Test with node-${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: npm ci
+    - run: npm test

Dockerfile

@@ -1,26 +1,25 @@
 # Check out https://hub.docker.com/_/node to select a new base image
-FROM node:12.14.0-alpine3.11
+FROM node:12.14.0-alpine3.11 as builder
+WORKDIR /sources
+COPY . .
+RUN npm ci --only=prod
+# Clean node_modules
+RUN npx modclean --no-progress --run
 
-# Set NODE_ENV to prevent installation of dev dependencies in production
-ARG NODE_ENV=development
-ENV NODE_ENV=${NODE_ENV}
+
+FROM node:12.14.0-alpine3.11
 
 # Set to a non-root built-in user `node`
 USER node
-
-# Create app directory (with user `node`)
-RUN mkdir -p /home/node/app
-
 WORKDIR /home/node/app
 
-# Install app dependencies
-# A wildcard is used to ensure both package.json AND package-lock.json are copied
-# where available (npm@5+)
-COPY --chown=node package*.json ./
+COPY --from=builder --chown=node /sources/node_modules ./node_modules
+COPY --from=builder --chown=node /sources/package.json ./package.json
+COPY --from=builder --chown=node /sources/src ./src
 
-RUN npm install
+ARG NODE_ENV=production
+ENV NODE_ENV=${NODE_ENV}
 
-# Bundle app source code
-COPY --chown=node . .
+EXPOSE 8000
 
 CMD [ "npm", "run", "start:prod" ]

docker-compose.yml

@@ -2,7 +2,7 @@ version: "3"
 
 services:
   db:
-    image: postgres:12.1
+    image: postgres:12.5-alpine
     ports:
       - 8432:5432
     volumes:
@@ -13,6 +13,9 @@ services:
       - "8000:8000"
     env_file:
       - .env
+    volumes:
+      - .env:/home/node/app/.env
+      - .env.example:/home/node/app/.env.example
     depends_on:
       - db
     command: npm start