Image build problem on onprem-poc (unsupported status code 504)

build.log

INFO[1028] Pushing layer registry.onprem-poc.org.neu.ro/artemyushkovskiy/layer-cache/cache:9a9d965b463ba3376bbe100cd9bfd302f6f901fac8954390303e9af2be6fec87 to cache now 
INFO[1029] RUN ssh-keygen -f /id_rsa -t rsa -N neuromation -q 
INFO[1029] cmd: /bin/sh                                 
INFO[1029] args: [-c ssh-keygen -f /id_rsa -t rsa -N neuromation -q] 
INFO[1029] Running: [/bin/sh -c ssh-keygen -f /id_rsa -t rsa -N neuromation -q] 
INFO[1029] Taking snapshot of full filesystem...        
DEBU[1084] build: composite key for command RUN ssh-keygen -f /id_rsa -t rsa -N neuromation -q &{[sha256:b2e3766740d234f20eca2d9da5c845ee94501b1efeb3084a1275ca91589ee931 WORKDIR /project COPY apt.txt . ffd01b9676033e73f9ae476008d1d0a5d1fc9731c67b2a6383f69320a883241f RUN export DEBIAN_FRONTEND=noninteractive &&     apt-get -qq update &&     cat apt.txt | tr -d \r | xargs -I % apt-get -qq install --no-install-recommends % &&     apt-get -qq clean &&     apt-get autoremove &&     rm -rf /var/lib/apt/lists/* COPY requirements/ ./requirements/ 740ff0bff2f7acad7847d7f56c8de87d84974b0b9be24c9b7a689673034022b0 RUN pip install --no-cache-dir     -f https://dl.fbaipublicfiles.com/detectron2/wheels/cu100/index.html     -r requirements/dev.txt RUN ssh-keygen -f /id_rsa -t rsa -N neuromation -q]} 
DEBU[1084] build: cache key for command RUN ssh-keygen -f /id_rsa -t rsa -N neuromation -q ede6eabf10a000464ebd83979de2ef2d2a253c9db621aa262b244608418d40b1 
INFO[1084] Pushing layer registry.onprem-poc.org.neu.ro/artemyushkovskiy/layer-cache/cache:ede6eabf10a000464ebd83979de2ef2d2a253c9db621aa262b244608418d40b1 to cache now 
DEBU[1973] mapping stage idx 0 to digest sha256:8ff543e1409a7ba203e0c7084c0b4e86ac35613b2dbffa1b995f883eef08b6e5 
DEBU[1973] mapping digest sha256:8ff543e1409a7ba203e0c7084c0b4e86ac35613b2dbffa1b995f883eef08b6e5 to cachekey ede6eabf10a000464ebd83979de2ef2d2a253c9db621aa262b244608418d40b1 
error pushing image: failed to push to destination registry.onprem-poc.org.neu.ro/artemyushkovskiy/neuromation-mlops_project_zero:v1.6.1: HEAD https://registry.onprem-poc.org.neu.ro/v2/artemyushkovskiy/neuromation-mlops_project_zero/blobs/sha256:82b3eb0d33aca8e03a7fdcd3a173bdc4b0c87619e046f123ca64ba3964705ae7: unsupported status code 504

Dockerfile

FROM neuromation/base:v1.6   # take not the ":latest" base image

WORKDIR /project

COPY apt.txt .
RUN export DEBIAN_FRONTEND=noninteractive && \
    apt-get -qq update && \
    cat apt.txt | tr -d "\r" | xargs -I % apt-get -qq install --no-install-recommends % && \
    apt-get -qq clean && \
    apt-get autoremove && \
    rm -rf /var/lib/apt/lists/*

COPY requirements/ ./requirements/
RUN pip install --no-cache-dir \
    -f https://dl.fbaipublicfiles.com/detectron2/wheels/cu100/index.html \
    -r requirements/base.txt

RUN ssh-keygen -f /id_rsa -t rsa -N neuromation -q

live.yml

kind: live
title: MLOps Project Zero
id: mlops_project_zero
...
images:
  dev:
    ref: image:neuromation-$[[ flow.flow_id ]]:v1.6.1
    dockerfile: $[[ flow.workspace ]]/docker/Dockerfile
    context: $[[ flow.workspace ]]/
...

requirements_SLASH_base.txt

# Infrastructure:
neuromation>=20.4.6
dvc==0.94.0

# Code:
pyyaml
detectron2==0.1.1+cu100
pycocotools-fix==2.0.0.1
torch==1.4.0
torchvision==0.5.0
opencv-python>=4.2.0.34

# pycoco fails with numpy>=1.18 (see https://github.com/cocodataset/cocoapi/issues/356)
numpy==1.17.5