heptapod-ci: add the appropriate configuration file

Tests are broken with Mercurial 4.4 and 4.5 right now so I'm adding the tests
for those version later.
2 jobs for branch/default in 2 minutes and 29 seconds (queued for 8 seconds)
latest
Name Stage Failure
failed
tests-stable Test
Failed test-format-source-tools.t#inplace: output changed
Failed test-format-source-tools.t#inplace-mode: output changed
Failed test-format-source-tools.t#pipe-mode: output changed
Failed test-format-source.t: output changed
Failed test-format-tool-version.t: output changed
# Ran 23 tests, 0 skipped, 19 failed.
python hash seed: 171212842
Cleaning up file based variables
ERROR: Job failed: exit code 1
failed
tests-default Test
Failed test-format-source-tools.t#inplace-mode: output changed
Failed test-format-source-tools.t#pipe-mode: output changed
Failed test-format-source.t: output changed
Failed test-format-tool-version.t: output changed
# Ran 23 tests, 0 skipped, 19 failed.
python hash seed: 909253966
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit code 1