Use full name for docker caching

.github/workflows/test.yaml

@@ -17,9 +17,9 @@ jobs:
         git submodule update --init
     - run: |
         docker pull $(grep -ioP '(?<=^from)\s+\S+' Dockerfile.openpilot) || true
-        docker pull commaai/openpilot:latest || true
+        docker pull docker.io/commaai/openpilot:latest || true
 
-        docker build --cache-from commaai/openpilot:latest -t tmppilot -f Dockerfile.openpilot .
+        docker build --cache-from docker.io/commaai/openpilot:latest -t tmppilot -f Dockerfile.openpilot .
         docker save tmppilot:latest | gzip > tmppilot.tar.gz
     - uses: actions/upload-artifact@v1
       with: