The environment variable ImageOS must be set

[shoukoo]

Hello there,

We're getting the following error message when using the latest setup-ruby ( v1.51.1) on our self-hosted runners. Is this something we have to set at our end onward?

We were able to workaround this issue by setting ImageOS var to ubuntu18 or using the older version (v1.49.0)

Thanks,
Andy

[eregon]

Yes, please set this variable, otherwise it's too complicated to guess the platform and version.

[eregon]

Added in the README in 34fbbc1

[shoukoo]

Great, thanks for maintaining this action!