Add Option to Let Users Specify Custom Workflow Locations

[saadmk11]

We are currently using GitHub's API (which always returns .github/workflows/*.y(a)ml files) to find the workflow locations, This works in most cases but if a repository has workflow files in different locations then those files are not checked.

Originally Posted By: @villelahdenvuo
Ref: #29

for iterating the workflow files.
By default it will look in .github/workflows/*.y(a)ml for files.

Not my code, but I'm using this fork because I have some workflows in different folders that I would also like to keep up to date, but the fork is lacking the latest updates.