1. Restore the original simple version of `configure.sh`
Restores 08e37f4 "Refactor configure.sh"
Reverts b87ee95b "Fixed configure.sh script and gh actions"
2. Use GitHub Secrets instead of a private git repository to enhance
security standards and ensure credentials are encrypted and safely
managed.
3. Document credentials used by GitHub Actions in docs/CREDENTIALS.md
4. Include `network_security_config.xml` directly into the repo
as it has nothing sensitive.
5. Include Apple WWDR intermediate certificates directly into the repo
as they are not sensitive and publicly available.
https://developer.apple.com/help/account/reference/wwdr-intermediate-certificates
6. Add `private.h` in the repository since it does not differ from
`private_defaults.h`.
Signed-off-by: Roman Tsisyk <roman@tsisyk.com>
