Add Dockerfile and GH action to push to Docker Hub

.github/workflows/docker.yml

@@ -0,0 +1,35 @@
+name: publish-to-docker
+
+on:
+  push:
+    branches:
+      - "mistress"
+
+jobs:
+  publish:
+    if: "!contains(github.event.head_commit.message, 'skip ci')"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        name: Check out code
+
+      - name: Set version
+        run: echo VERSION=`date +%Y%m%d` >> $GITHUB_ENV
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+            platforms: linux/amd64,linux/arm64
+      -
+        name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      -
+        name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          platforms: linux/amd64
+          tags: ${{ secrets.DOCKER_USERNAME }}/pot_generator:latest,${{ secrets.DOCKER_USERNAME }}/pot_generator:${{ env.VERSION }}

Dockerfile

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+FROM node:18.20.4-alpine3.20
+RUN mkdir -p /opt/app
+WORKDIR /opt/app
+COPY package.json package-lock.json index.js LICENSE .
+RUN npm install
+EXPOSE 3000
+CMD [ "node", "index.js" ]