I'm relatively new to building R packages and I just attempted to move from Travis CI to Github Actions.
When I try to run a check using GHA the job fails. It appears that the cask command is throwing things off, but I'm unsure how to fix it (see photo).
A couple of forum posts noted that the "cask" command is outdated, but I never wrote it into the workflow so I'm unsure where it's being called from.
Would greatly appreciate any tips!
It seems the tutorial you used to install Cask is outdated.
cask is no longer a brew command.
When you want to install a Cask, just do brew install or brew install --cask instead of brew cask install (as shown in line 8 on your print).
Possibly, if you need to know how to do something with brew, you can always use brew help, or read the manual with man brew. brew help <command> will also show you a help message for a command (e.g. brew help upgrade).
