Add ability to change config path

[RodionKorneev]

Is your feature request related to a problem? Please describe.

actions/labeler project also uses labeler.yml config by default. Their config based on change's path and has another sintax.
If I wanna to use both actions together I need to set config path manually due to conflict.
actions/labeler has ability to change path, but it is a little bit strange to have configs named like
labeler.yml - for labeler-action
labeler-suffix.yml - for labeler

Describe the solution you'd like

I would prefer to have ability to change path for labeler-action.

Describe alternatives you've considered

As alternative - change default config path to full action name: labeler-action.yml