Feature request: version pinning

[bmaupin]

Hi,

First of all, thanks for this! I used it for quite a while, but unfortunately I had to stop using it. It always uses the latest version of htmlproofer, which is great, however due to breaking changes upstream the GitHub Action would periodically break.

It broke most recently last week when htmlproofer was upgraded to 4.4.2, which introduced a bug, and now again that htmlproofer has been upgraded to v5.

I'm honestly not sure what the best way to handle this would be, because I think it would require tagging the container image as well as the GitHub Action itself. For now I had to resort to just using this action instead: https://github.com/anishathalye/proof-html

... but that action isn't quite as nice because it's only set up with a limited number of options. I really love how this action is set up so that it is future-proof as the htmlproofer CLI parameters change.

Thanks!

[chabad360]

Creating various tags on the action for various versions could potentially work, but it is a bit complicated (for various reasons).

This action was sort of designed to be in maintenance mode from the start (hence the auto updating and such). But if you have any ideas for how I could go about doing that or even a PR, that would go a long way to making that possible.