explicit docker install?

.gitea/workflows/build.yaml

@@ -13,8 +13,8 @@ jobs:
 
     - name: Install prerequisites
       run: |
-        sudo apt-get update
-        sudo apt-get install -y xz-utils unzip
+        apt-get update
+        apt-get install -y xz-utils unzip
 
     - uses: https://gitea.com/actions/checkout@v4
 
@@ -25,6 +25,8 @@ jobs:
         username: ${{ secrets.docker_username }}
         password: ${{ secrets.docker_password }}
 
+    - name: Set up Docker Buildx
+      uses: https://github.com/docker/setup-buildx-action@v3
 
     - name: Build
       uses: https://github.com/docker/build-push-action@v2