Clarify path semantics for `abom scan`

[sschuberth]

I'm having a bit of trouble understanding how to specify a path for abom scan. Help says:

Usage:
  abom scan [path or github.com/owner/repo] [flags]

So if I'm in the root of my cloned Git project, I would expect abom scan .github/workflows to work, but this gives

Error: parsing workflows: reading workflows directory: open .github/workflows/.github/workflows: no such file or directory

So I though, ok, the path is always supposed to be relative to .github/workflows, and I tried abom scan .github/workflows/test, but that gives

Error: target must be a local directory or github.com/owner/repo: test

although the .github/workflows/test directory exists.

As a user, what I would expect is for a path passed as an argument:

• if the path is absolute, use it as-is.
• if the path is relative, resolve it against the current working directory (not the .github/workflows directory).
• if the path points to a directory, scan all workflows in that directory (non-recursively).
• if the path points to a file, scan only the workflow in that file.
• if no path is given, default to using a relative path of ".github/workflows".

I'm also not a big fan of the special "github.com/owner/repo" syntax, as that present scanning local paths with than name. A way to solve that would be to require a --url option for that mode.