Add counts to output?

[billyvg]

So one of the ways we're using this is to find added/modified files to pass to our linter. We use list-files: shell since we pass this list of files to the linter. However, we'd also like to get the count of files so that we can do some different conditionals based on the # of changed files.

Any objections to adding the count to the action outputs?

[dorny]

If there is use-case for it then why not. I will add it later today.
We already have ${FILTER_NAME}_files so this could be ${FILTER_NAME}_count or something like that.

[billyvg]

Thank you once again!