Enable plugin usage via --jira-enabled=true

[liiight]

I'd like to have the option wether to use the plugin or not pass as an envvar in my CI. Currently this is possible either via manipulating the command arts via a bash script or using the PYTEST_ADDOPTS envvar. Both of these aren't nice.

I propose adding a --jira-enabled=true option, that will accompany the other existing flags as to not break compatibility.

If you like this I can put out a PR for this change.

WDYT?

[lukas-bednar]

I am worried about --jira flag, the presence or absence of this flag says whether to enable or disable this plugin.
This --jira-enable flags seems to be duplicate to me ... or I am overlooking something ?

[liiight]

hmm, using pytest's PYTEST_ADDOPTS seems nicer than I though:

$ PYTEST_ADDOPTS="--jira"
$ pytest

I was thinking using an explicit flag would be nicer though:

$ JIRA_ENABLED="true"
$ pytest --jira-enabled=$JIRA_ENABLED

But I guess it's a minor/not an issue...