Exit with error status code when plan preview failed

[TakumaKurosawa]

What would you like to be added:
Call os.Exit(1) when plan-preview sent an error message.

Why is this needed:
Plan preview CI send error comment but workflow is still succeeded.
So we have to exit with error status code when exception case.

[TakumaKurosawa]

I'd like to work on this.
I've already make PR: #4659

[github-actions]

This issue is stale because it has been open 180 days with no activity. Remove stale label or comment or this will be closed in 7 days.

[t-kikuc]

This is already solved.

pipecd/tool/actions-plan-preview/main.go

Line 152 in 972d114

os.Exit(1)