Document how to deal with GitHub disabling CompatHelper workflows after 60 days of inactivity

GitHub disables actions after 60 days of inactivity and there is discourse about how to address it but I cannot quite tell what it the appropriate solution:
https://discourse.julialang.org/t/compathelper-workflows-disabled-after-60-days-of-inactivity/48870

It would be great if the README here would address this issue specifically and definitively because an Oct. 2020 comment there suggests that a CompatHelper action will be "effectively deprecate[d]" but I still see lots of actively maintained packages using it so I doubt that prediction has come true yet
https://discourse.julialang.org/t/compathelper-workflows-disabled-after-60-days-of-inactivity/48870/9

Should we package developers be doing anything other than using the latest `CompatHelper.yml` file?