Update .forgejo/workflows/docker.yml

.forgejo/workflows/docker.yml

@@ -10,14 +10,14 @@ jobs:
       - name: Setup Alpine 
         uses: https://git.swee.codes/swee/setup-alpine@main
         with:
-          additional: docker
+          additional: docker docker-cli-buildx 
       - uses: actions/checkout@v3
       - name: Start daemon
         run: dockerd &
       - name: Login to Docker
         run: echo ${{ secrets.TOKEN }} | docker login git.swee.codes --username swee --password-stdin
       - name: Build docker image
-        run: docker build -t git.swee.codes/swee/opengist:nightly .
+        run: docker buildx build -t git.swee.codes/swee/opengist:nightly .
         working-directory: ./docker/opengist
       - name: Push docker image
         run: docker push git.swee.codes/swee/opengist --all-tags