Make git a runtime dependency

[ssbarnea]

As we received numerous bug reports which proved to be caused by
the missing git, we make git a permanent runtime dependency. This will
make the tool behavior more consistent as before that behavior would
have being different if git was missing.

[fclaerho]

Hi @ssbarnea !

I just hit this weird case of installing innocently ansible-lint in a minimal python docker image to lint a playbook, and having it fail flat with this:

# pipenv run ansible-lint -vv --parseable --skip-list fqcn-builtins,unnamed-task,key-order playbook.yml
…
Failed to find runtime dependency 'git' in PATH

I've traced back this error to this issue, which make "git" a required dependency of ansible-lint, a change very strange in itself (ansible-lint being a Python tool initially, now we have a non-python dependency -- the above ticket description refers to git-related issues, could this be detailed?) — and as importantly it's simply not documented anywhere in the installation page (and indeed the change list above only covers the code):
https://ansible-lint.readthedocs.io/installing/

Could this new requirement be added to the doc? (or am I missing something?)

[ssbarnea]

Hi! Shotly, there is no need to add it to the docs because we have an incoming change that will remove the need for git executable.

[fclaerho]

Good to know, thanks for the info 👍🏻

[ssbarnea]

@fclaerho Take a look at #3507 and test if you can.