[FIX] Add explicit permission to detekt workflow

[jesmrec]

Internal code scanning returned the following issue (medium severity):

https://github.com/owncloud/android/security/code-scanning/7

as explanation:

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.

Fixed by adding the permissions: block with just read permission to the detekt workflow, avoiding the default write pemission.

Related Issues

App: https://github.com/owncloud/android/security/code-scanning/7

• Add changelog files for the fixed issues in folder changelog/unreleased. More info here
• Add feature to Release Notes in ReleaseNotesViewModel.kt creating a new ReleaseNote() with String resources (if required)

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QA

[joragua]

LGTM! 💯