added Dockerfile & Github actions flow

.github/workflows/main.yaml

@@ -0,0 +1,15 @@
+name: Publish Docker
+on:
+  push:
+    branches: [ master ]
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+      - name: Publish to Registry
+        uses: elgohr/Publish-Docker-Github-Action@master
+        with:
+          name: haaaqs/umami:latest
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}

Dockerfile

@@ -0,0 +1,11 @@
+FROM node:12.18-alpine
+
+COPY . /app
+WORKDIR /app
+
+RUN npm install \
+ && npm run build-mysql-client \
+ && npm run build
+
+EXPOSE 3000
+CMD ["npm", "start"]