Add Docker workflow for publishing Docker image

.github/workflows/docker.yml

@@ -0,0 +1,39 @@
+name: Publish Docker Image
+
+on:
+  workflow_dispatch:
+  push:
+    tags:
+      - "*"
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - 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: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push Docker Image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: Dockerfile
+          push: true
+          tags: |
+            fvergaracl/game:latest
+            fvergaracl/game:${{ github.ref_name }}
+            fvergaracl/game:${{ github.ref_name }}-${{ github.run_number }}