(maint) ci: add GitHub token permissions for workflows

[varunsh-coder]

This PR adds minimum token permissions for the GITHUB_TOKEN using https://github.com/step-security/secure-workflows.

GitHub recommends defining minimum GITHUB_TOKEN permissions for securing GitHub Actions workflows

• https://github.blog/changelog/2021-04-20-github-actions-control-permissions-for-github_token/
• https://docs.github.com/en/actions/security-guides/automatic-token-authentication#modifying-the-permissions-for-the-github_token
• The Open Source Security Foundation (OpenSSF) Scorecards treats not setting token permissions as a high-risk issue

This project is part of the top 100 critical projects as per OpenSSF (https://github.com/ossf/wg-securing-critical-projects), so fixing the token permissions to improve security.

Signed-off-by: Varun Sharma [email protected]

[puppetlabs-jenkins]

Can one of the admins verify this patch?

[CLAassistant]

All committers have signed the CLA.

[LivingInSyn]

@puppetlabs/security is good with the change 👍

[joshcooper]

@varunsh-coder thank you for your contribution! Could you prefix your git commit summary with (maint) ... as
described here and force push to your feature branch?

[varunsh-coder]

@varunsh-coder thank you for your contribution! Could you prefix your git commit summary with (maint) ... as
described here and force push to your feature branch?

Done!