[CHORE]: Add Rocky Linux setup script variant

[jonpspri]

Summary

The existing scripts/ubuntu-contextforge-setup-script.sh supports Ubuntu (and possibly Debian derivative) operating systems. We need a new variant script to support Rocky Linux 10.0 (and potentially other RHEL-compatible distributions).

Tasks

• Create scripts/rocky-contextforge-setup-script.sh based on the Ubuntu variant
• Adapt package installation to use dnf instead of apt
• Update Docker installation steps for Rocky/RHEL (use Docker CE repo for RHEL-based systems)
• Adjust OS detection to check for Rocky Linux and RHEL-compatible distros
• Update firewall configuration if needed (firewalld vs ufw)
• Test on Rocky Linux 10.0
• Consider testing on other RHEL derivatives (AlmaLinux, CentOS Stream)

Reference

The Ubuntu script is located at: scripts/ubuntu-contextforge-setup-script.sh

Key differences to account for:

• Package manager: dnf vs apt
• Service management: both use systemctl (no change needed)
• Docker repo setup differs for RHEL-based systems
• SELinux considerations (if applicable)
• Different package names (e.g., gnupg2 vs gnupg)