try to fix quemu condition

.github/workflows/docker.yml

@@ -51,7 +51,7 @@ jobs:
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
-        if: ${{ matrix.qemu }} == 'true'
+        if: ${{ matrix.qemu }} == true
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1