Exit with Code 1 if registering a runner fails (#228)

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### It's a "simple dirty fix" and I don't have any experiences with Go, so if this doesn't match your coding compliance, please adjust the code as needed

I'm using bash scripts to register a token

`./act_runner/act_runner register --no-interactive --name runner$number --instance http://localhost:3000 --token $token`

But when a token is invalid, the command still returns 0, which is not practical for automation.
A simple non-zero return would be more convenient for power users and developers.

Co-authored-by: Markus Löffler <markus.loeffler@netcare.de>
Co-authored-by: techknowlogick <techknowlogick@noreply.gitea.com>
Reviewed-on: https://gitea.com/gitea/act_runner/pulls/228
Reviewed-by: techknowlogick <techknowlogick@noreply.gitea.com>
Co-authored-by: MarkusLoeffler01 <markusloeffler01@noreply.gitea.com>
Co-committed-by: MarkusLoeffler01 <markusloeffler01@noreply.gitea.com>

This commit was merged in pull request #228.

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