Add a license check for new files

[iyabchen]

hashicorp/terraform-provider-google#20127

• Check license type (using a go-licenses library)
• Check copyright year (using strings.Contains)

Tested in #13805.

Release Note Template for Downstream PRs (will be copied)

See Write release notes for guidance.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR hasn't generated any diffs, but I'll let you know if a future commit does.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR hasn't generated any diffs, but I'll let you know if a future commit does.

[github-actions]

@shuyama1 This PR has been waiting for review for 3 weekdays. Please take a look! Use the label disable-review-reminders to disable these notifications.

[github-actions]

@GoogleCloudPlatform/terraform-team @shuyama1 This PR has been waiting for review for 1 week. Please take a look! Use the label disable-review-reminders to disable these notifications.

[shuyama1]

Hey @melinath, just want to confirm with you if this change addresses what's asked in hashicorp/terraform-provider-google#20127

This license text validation is currently implemented to check files in the mmv1 folder. We'd like to confirm if this is the desired scope, or should it be broader?

Also, the ticket description mentions "We should automate validation of its presence and correctness". Could you please clarify what specific aspects of correctness this should be validating?

[melinath]

Correctness:

• Is the license text being added the correct license text?
• Does it have the current year

Which files: Basically, any files that correspond to other files that currently have it. MMv1 yaml, definitely. tpgtools we can ignore for now because it's not getting new stuff added. I'm not sure if there are other files.

We should only be running this check for files modified in the current PR.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR hasn't generated any diffs, but I'll let you know if a future commit does.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR hasn't generated any diffs, but I'll let you know if a future commit does.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR hasn't generated any diffs, but I'll let you know if a future commit does.

[iyabchen]

The current code is checking only the mmv1 folder for .tmpl, .go, .yaml files, and only for new files. If checking for just modified files, then many files will need a touch for the copyright year.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR hasn't generated any diffs, but I'll let you know if a future commit does.

[github-actions]

@shuyama1 This PR has been waiting for review for 3 weekdays. Please take a look! Use the label disable-review-reminders to disable these notifications.