Revert "Setup Docker compose instead of just buildx."

This reverts commit cb9684e.

Author: dokterbob

.github/workflows/test-docker.yml

@@ -15,8 +15,8 @@ jobs:
       uses: pierotofy/set-swap-space@master
       with:
         swap-size-gb: 12
-    - name: Set up Docker Compose
-      uses: docker/setup-compose-action@v1
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
     - name: Build webapp
       uses: docker/build-push-action@v6
       with: