Hey Github Action heads: Is there any way to get a file timestamp from a file in the working tree? I'm trying to static-gen HTML files, and use a most-recently-used home page, and it's defeated each time by re-generating everything from scratch.

I know I need to use action/cache, but now I want to pass an "if-modified-since" parameter to my Azure upload action, and I can't figure out how to get the if-modified-since of the last cached run.

And I'm open to a different way to do this, too, if there's a better way....