Add CI workflow for building and publishing Docker image

.github/workflows/ci.yml

@@ -0,0 +1,51 @@
+name: Test Build and Publish Docker image
+
+on:
+  push:
+    branches: [main]
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up NodeJS
+        uses: actions/setup-node@v2
+        with:
+          node-version: 18
+
+      - name: Install dependencies
+        run: yarn install
+
+      - name: Run tests
+        run: yarn test
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_TOKEN }}
+
+      - name: Create .env file
+        run: echo "${{ secrets.ENV }}" | base64 -d > .env
+
+      - name: Build and tag Docker image
+        run: |
+          docker build -t ${{ secrets.DOCKER_HUB_USERNAME }}/stockdog:pr-${{ github.event.number }} .
+
+      - name: Push Docker image
+        run: docker push ${{ secrets.DOCKER_HUB_USERNAME }}/stockdog:pr-${{ github.event.number }}
+
+      - name: Update image metadata
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ secrets.DOCKER_HUB_USERNAME }}/stockdog:pr-${{ github.event.number }}
+          tags: |
+            type=sha
+          labels: |
+            org.opencontainers.image.title=StockDog App
+            org.opencontainers.image.description=Stock market analysis app
+            org.opencontainers.image.url=https://github.com/${{github.repository}}
+            org.opencontainers.image.revision=${{github.sha}}
+            org.opencontainers.image.licenses=MIT