Build: Limit permissions for GitHub workflows

Add explicit permissions section[^1] to workflows. This is a security
best practice because by default workflows run with extended set
of permissions[^2] (except from `on: pull_request` from external forks[^3].
By specifying any permission explicitly all others are set to none. By using
the principle of least privilege the damage a compromised workflow can do
(because of an injection[^4] or compromised third party tool or action) is
restricted. It is recommended to have most strict permissions on the top
level[^5] and grant write permissions on job level[^6] on a case by case
basis.

[^1]: https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#permissions
[^2]: https://docs.github.com/en/actions/security-guides/automatic-token-authentication#permissions-for-the-github_token
[^3]: https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
[^4]: https://securitylab.github.com/research/github-actions-untrusted-input/
[^5]: https://github.com/ossf/scorecard/blob/main/docs/checks.md#token-permissions
[^6]: https://docs.github.com/en/actions/using-jobs/assigning-permissions-to-jobs

Closes gh-5119

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