Add a step to set up buildx in integration tests

.github/workflows/test-integration.yml

@@ -11,6 +11,10 @@ jobs:
         with:
           fetch-depth: 2
 
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v2
+
       - name: Get changed files
         id: changed-files
         uses: tj-actions/changed-files@v14.1