Adds workflow to build and publish Docker img

.github/workflows/docker.yml

@@ -0,0 +1,73 @@
+name: 🐳 Build + Publish Docker Image
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+    tags:
+      - '*'
+    paths:
+      - src/**
+      - api/**
+      - public/**
+      - Dockerfile
+
+env:
+  IMAGE_NAME: web-check
+  DOCKER_USER: lissy93
+  GHCR_REGISTRY: ghcr.io
+  DOCKERHUB_REGISTRY: docker.io
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Extract tag name
+        shell: bash
+        run: echo "GIT_TAG=$(echo ${GITHUB_REF#refs/tags/} | sed 's/\//_/g')" >> $GITHUB_ENV
+
+      - name: Compute tags
+        id: compute-tags
+        run: |
+          if [[ "${{ github.ref }}" == "refs/heads/master" ]]; then
+            echo "GHCR_TAG=${GHCR_REGISTRY}/${DOCKER_USER}/${IMAGE_NAME}:latest" >> $GITHUB_ENV
+            echo "DOCKERHUB_TAG=${DOCKERHUB_REGISTRY}/${DOCKER_USER}/${IMAGE_NAME}:latest" >> $GITHUB_ENV
+          else
+            echo "GHCR_TAG=${GHCR_REGISTRY}/${DOCKER_USER}/${IMAGE_NAME}:${GIT_TAG}" >> $GITHUB_ENV
+            echo "DOCKERHUB_TAG=${DOCKERHUB_REGISTRY}/${DOCKER_USER}/${IMAGE_NAME}:${GIT_TAG}" >> $GITHUB_ENV
+          fi
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ${{ env.GHCR_REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          registry: ${{ env.DOCKERHUB_REGISTRY }}
+          username: ${{ env.DOCKER_USER }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Build and push Docker images
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          platforms: linux/amd64
+          tags: |
+            ${{ env.GHCR_TAG }}
+            ${{ env.DOCKERHUB_TAG }}