(chocolatey#2244) Add Docker build into main workflow

.github/workflows/build.yml

@@ -39,4 +39,25 @@ jobs:
      - name: Build with Mono
        run: |
           chmod +x build.sh
-          $GITHUB_WORKSPACE//build.sh -v
+          $GITHUB_WORKSPACE//build.sh -v
+  # Build using Mono in Docker on Ubuntu
+  docker-build:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: docker/Dockerfile.linux
+          push: false
+          tags: chocolatey/choco:latest