Heptapod CI: merged pytest-shard from the stable branch.

4 jobs for branch/default in 1 minute and 1 second
Name Stage Failure
flake8 Lint
Downloading artifacts
Running before_script and script
$ flake8 tests conftest.py
tests/test_ssh.py:1:1: F401 'subprocess' imported but unused
tests/utils/heptapod.py:488:80: E501 line too long (83 > 79 characters)
conftest.py:159:80: E501 line too long (81 > 79 characters)
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit code 1