Fetch OTP release based on ImageOS environment variable

[deniskulicek]

Once hexpm/bob#68 is merged we'll probably want to fetch correct OTP build based on the vm running the action.

Obviously the checks will be failing until bob the builder builds those OTP versions.

[ericmj]

hexpm/bob#68 has been merged. The images will start to build and should all be available in less than 24 hours (hopefully). Keep in mind that all images have not yet been fully tested and should therefor be considered experimental. Maybe we should make this opt-in behind a config until we have determined they are good?

[deniskulicek]

@ericmj sounds good to me. Any implementation suggestions? I’d add input variable for opting in, otherwise default to “ubuntu-14.04”

[ericmj]

Maybe a new opt-in config such as experimental-otp: true could be used. In the future, when the new builds are deemed stable we would ignore this config.

[deniskulicek]

@ericmj input flag experimental-otp is now added. Unless the flag is provided, we keep using ubuntu-14.04, otherwise one of ubuntu-16.04, ubuntu-18.04 or ubuntu-20.04 is used - based on runner ImageOS version. Please check it out and let me know if there is anything missing.

[ericmj]

The builds have completed and are now available for all Ubuntu LTS versions.

Please check it out and let me know if there is anything missing.

Everything looks good to me but @jclem has the final say of course.

[jclem]

Sorry for the delay here—this looks great.