Draft: [CI] copyright header job

• Related issues: N/A
• Requested reviewers: @pihlajakuja, @kiene

Reason why this change is needed

• Why use humans when you can script it with CI ✨

Description of the change

• Job to check copyright header was added
• This could be converted to a manual-trigger job to avoid running on every MR

Affected operating points

• N/A