update dockerfile and add github actions to push image to dockerhub

Author: yunhan0

.github/workflows/server-ci.yml

@@ -0,0 +1,33 @@
+name: ci
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  path-context:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out the repo
+      uses: actions/checkout@v2
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v1
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v1
+    - name: Login to DockerHub
+      uses: docker/login-action@v1
+      with:
+        username: ${{ secrets.DOCKERHUB_USERNAME }}
+        password: ${{ secrets.DOCKERHUB_TOKEN }}
+    - name: Build and push
+      id: docker_build
+      uses: docker/build-push-action@v2
+      with:
+        context: ./server
+        file: ./server/Dockerfile
+        push: true
+        tags: koa-vue-fullstack/server:latest
+    - name: Image digest
+      run: echo ${{ steps.docker_build.outputs.digest }}

server/Dockerfile

@@ -1,18 +1,18 @@
-# Use an node 8 runtime as a parent image
-FROM node:8.9.4
-
-# Set environment vaiable: server port as 3002
-ENV AUTH_SECRET=vHJcV7
-
-# Set the working directory to /server
-WORKDIR /server
-
-# Copy the current directory contents into the container at /server
-ADD . /server
-
-RUN npm install
-
-# Make port 3000 available to the world outside this container
-EXPOSE 3000
-
-CMD ["npm", "run", "build"]
+# Use an node 10 runtime as a parent image
+FROM node:10.12.0
+
+# Set environment vaiable: server port as 3002
+ENV AUTH_SECRET=vHJcV7
+
+# Set the working directory to /server
+WORKDIR /server
+
+# Copy the current directory contents into the container at /server
+ADD . /server
+
+RUN npm install
+
+# Make port 3000 available to the world outside this container
+EXPOSE 3000
+
+CMD ["npm", "run", "build"]