[sr-dev] [kamailio/kamailio] GitHub Workflows security hardening (PR #3248)

[Alex]

This PR adds explicit [permissions section](https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#permissions) to workflows. This is a security best practice because by default workflows run with [extended set of permissions](https://docs.github.com/en/actions/security-guides/automatic-token-authentication#permissions-for-the-github_token) (except from `on: pull_request` [from external forks](https://securitylab.github.com/research/github-actions-preventing-pwn-requests/)). 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](https://securitylab.github.com/research/github-actions-untrusted-input/) or compromised third party tool or action) is restricted.
It is recommended to have [most strict permissions on the top level](https://github.com/ossf/scorecard/blob/main/docs/checks.md#token-permissions) and grant write permissions on [job level](https://docs.github.com/en/actions/using-jobs/assigning-permissions-to-jobs) case by case.
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/3248

-- Commit Summary --

  * build: harden main.yml permissions
  * build: harden pull_request.yml permissions

-- File Changes --

    M .github/workflows/main.yml (2)
    M .github/workflows/pull_request.yml (2)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/3248.patch
https://github.com/kamailio/kamailio/pull/3248.diff

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