Add Alpine Linux support for server installations

[bamontejano]

Alpine Linux is a lightweight and security-focused distribution often used for containerized environments. Currently, Coolify's installation scripts primarily target Debian/Ubuntu/RHEL-based systems that use apt or dnf.

This issue proposes adding support for Alpine Linux servers by:

• Detecting Alpine Linux (/etc/alpine-release or presence of apk).
• Using apk add --no-cache docker docker-compose for installation.
• Configuring the Docker service with OpenRC (rc-update add docker boot and service docker start).

I was inspired to investigate Alpine support while reviewing the requirements for Debian 13 support (Issue #8154).

This would allow Coolify to be deployed on Alpine-based systems, reducing the image size and improving security.