Add buildx setup for workflow

.github/workflows/main.yml

@@ -14,6 +14,7 @@ env:
   REGISTRY: git.wylab.me
   IMAGE_NAME: wylab/ws14-docker-linux-server
   TARGET_PLATFORM: linux-x64
+  DOCKER_PLATFORM: linux/amd64
   WYLAB_SOURCE_REPO: https://git.wylab.me/wylab/wylab-station-14.git
   WYLAB_SOURCE_REF: master
 
@@ -27,6 +28,14 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: ${{ env.DOCKER_PLATFORM }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Resolve wylab commit
         id: wylab
         env:
@@ -57,6 +66,7 @@ jobs:
         with:
           context: .
           push: true
+          platforms: ${{ env.DOCKER_PLATFORM }}
           tags: |
             ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
             ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}