Rename containername mega-linter-runner argument to container-name

[Kurt-von-Laven]

Describe the bug

It seems odd to spell the argument containername when the name of the package itself is hyphenated, and containername will get flagged as a CSpell error in downstream projects that use MegaLinter (e.g., when committing a script that runs MegaLinter to their package.json or .pre-commit-config.yaml). I did the code review in which this feature was added, so apologies for not considering this sooner.

To Reproduce

Steps to reproduce the behavior:

1. Read mega-linter-runner usage docs.

Expected behavior

I expected the argument to have a correctly spelled name.

Additional context

I considered adding "containername" to CSpell in streetsidesoftware/cspell-dicts#1207, and the maintainer understandably discouraged adding a misspelled word.

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[github-actions]

This issue has been automatically marked as stale because it has not had recent activity.
It will be closed in 14 days if no further activity occurs.
Thank you for your contributions.

If you think this issue should stay open, please remove the O: stale 🤖 label or comment on the issue.