introduce automated docker build

.github/workflows/build-and-push-dockerimage.yml

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+name: build and push bonares-handbook image
+
+on:
+  push:
+    branch:
+      - "retype"
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          # list of Docker images to use as base name for tags
+          images: |
+            zalf/bonares-handbook
+          tags: |
+            type=ref,event=tag
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          file: docker/Dockerfile

docker/Dockerfile

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+FROM nginx
+COPY . /usr/share/nginx/html