ci-hgitaly: image for tests against variable hg versions

This image will have all needed specific HGitaly dependencies,
but it will let the job itself pull and compile the wished
Mercurial version.
1 job for topic/default/hgitaly in 18 seconds
Name Stage Failure
failed
shellcheck Test
                   ^-- SC1117: Backslash is literal in "\)". Prefer explicit escaping: "\\)".
^-- SC1117: Backslash is literal in "\1". Prefer explicit escaping: "\\1".


In ci-py3-hgext3rd/make-version-variant line 9:
if (echo -e "5.3\n$version" | sort -n | head -n 1 | grep -vq "5.3"); then
^-- SC1117: Backslash is literal in "\n". Prefer explicit escaping: "\\n".

ERROR: Job failed: exit code 1