更新 GitHub Actions 工作流，移除 QEMU 和 Docker Buildx 设置步骤，直接构建 XMRig 镜像并复制构建产物。

.github/workflows/build.yml

@@ -12,17 +12,24 @@ jobs:
 
     steps:
       -
-        name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
+        name: Checkout code
+        uses: actions/checkout@v3
+      # -
+      #   name: Set up QEMU
+      #   uses: docker/setup-qemu-action@v3
+      # -
+      #   name: Set up Docker Buildx
+      #   uses: docker/setup-buildx-action@v3
+      # -
+      #   name: Build and push
+      #   uses: docker/build-push-action@v6
+      #   with:
+      #     push: false
+      #     tags: xmrig:latest
       -
-        name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-      -
-        name: Build and push
-        uses: docker/build-push-action@v6
-        with:
-          push: false
-          tags: xmrig:latest
+        name: Build XMRig
+        run: |
+          docker build -t xmrig:latest .
       -
         name: Copy XMRig
         run: |