Add CICD job to build mdbook server

.gitea/workflows/push.yaml

@@ -111,3 +111,36 @@ jobs:
         uses: actions/checkout@v4
       - name: Run rustfmt
         run: cargo fmt --check
+
+  mdbook-server:
+    runs-on: ubuntu-latest-docker
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to Gitea container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.registry }}
+          username: ${{ env.actions_user }}
+          password: ${{ secrets.CONTAINER_REGISTRY_TOKEN }}
+      - name: Get Image Name
+        id: get-image-name
+        run: |
+          echo "IMAGE_NAME=$(echo ${{ env.registry }}/${{ gitea.repository }}-mdbook | tr '[:upper:]' '[:lower:]')" >> $GITHUB_OUTPUT
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          tags: "${{ steps.get-image-name.outputs.IMAGE_NAME }}:${{ gitea.sha }}"
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+      - name: Build and push Docker image with "latest" tag
+        uses: docker/build-push-action@v5
+        if: gitea.ref == 'refs/heads/main'
+        with:
+          push: true
+          tags: "${{ steps.get-image-name.outputs.IMAGE_NAME }}:latest"
+          cache-from: type=gha
+          cache-to: type=gha,mode=max