enhance CI workflow with Docker Buildx setup and improved build command

.github/workflows/CI.yaml

@@ -19,6 +19,9 @@ jobs:
 
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3
+      with:
+        install: true
+        driver-opts: image=moby/buildkit:buildx-stable,network=host
 
     - name: Cache Docker layers
       uses: actions/cache@v3
@@ -29,7 +32,7 @@ jobs:
           ${{ runner.os }}-buildx-
 
     - name: Build Docker image
-      run: docker build --cache-from=type=local,src=/tmp/.buildx-cache --cache-to=type=local,dest=/tmp/.buildx-cache -t my-app .
+      run: docker buildx build --cache-from=type=local,src=/tmp/.buildx-cache --cache-to=type=local,dest=/tmp/.buildx-cache --output=type=docker -t my-app .
 
     - name: Run tests
       run: docker run my-app pytest