Replace Amazon linux by Ubuntu

[npalm]

Description

Currently we are shipping by default in the module scripts tuned for Amazon Linux and with some extra configuration Ubuntu can be used. But since GitHub is standard relying on Ubuntu several actions are not working on Amazon Linux. Or sometime updates of actions.are not fully supported out of the box.

By changing de standard configured linux version to Ubuntu we keep the module closer to the GitHub standard hosted runners. With extra configuration you can still adjust the Linux version

Once implemented this will trigger a major release.

Implementations directions

• Adjust scripts based on Ubuntu example.
• Update the launch templates default to Ubuntu
• Replace ubuntu example by an Amazon Linux one
• Update multi-runner examples
• Docs update

Other

Help, suggestions and feedback is welcome.

[bdellegrazie]

Hi, I've updated the Ubuntu example in mutli-runner to work correctly on my PR.
That should give you a starting point.

I'd also suggest making the choice between rootless and rootful docker a configuration option, especially for ephemeral nodes (I realise this is a security risk so default to rootless).