.github: set permissions contents to read

If a GitHub Actions job or workflow has no explicit permissions set,
then the repository permissions are used.
Repositories created under organizations inherit the organization
permissions.
The organizations or repositories created before February 2023 have the
default permissions set to read-write.

Often these permissions do not adhere to the principle of least
privilege and can be reduced to read-only, leaving the write permission
only to a specific types as "issues: write" or "pull-requests: write".

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