Refine CI

Author: philwebb

ci/tasks/build-ci-image.yml

@@ -25,6 +25,6 @@ run:
   - |
     mkdir -p /root/.docker
     cat > /root/.docker/config.json <<EOF
-    { "auths": { "https://index.docker.io/v1/": { "auth": "$DOCKER_HUB_AUTH" }, "$DOCKER_HUB_MIRROR": { "auth": "$DOCKER_HUB_MIRROR_AUTH" }}}
+    { "auths": { "https://index.docker.io/v1/": { "auth": "$DOCKER_HUB_AUTH" }, "https://$DOCKER_HUB_MIRROR": { "auth": "$DOCKER_HUB_MIRROR_AUTH" }}}
     EOF
     build