Split log output into groups for better readability

[Tyrrrz]

Context

Currently, the logs coming from v2.0-alpha versions of the action are borderline unreadable -- there's just too much information. This makes it very difficult to trace down build errors.

Suggested solution

GHA supports line grouping: https://docs.github.com/en/actions/reference/workflow-commands-for-github-actions#grouping-log-lines

Instead of printing 7000 unseparated lines, they could be separated into logical groups, perhaps one for each step of the process. That way you can more easily inspect different sections of the log.

Considered alternatives

Additional details