Running with gitlab-ci-multi-runner 9.4.2 (6d06f2e) on hoare@bw-cloud (e9911ae2) Using Docker executor with image key-ant-openjdk-8:latest ... Using docker image sha256:e0d7f1f0d26e35bee4d8c0860c42e89463ae2320de51bc50d0a26540850a703e for predefined container... Using locally found image version due to if-not-present pull policy Using docker image key-ant-openjdk-8:latest ID=sha256:91ebff51dc0fc59e759bda7318b03146ec88426a3915291e0816fad025f3d0c2 for build container... ERROR: Job failed (system failure): Error response from daemon: grpc: the connection is unavailable