Runs on Alpine and older Linux distributions

Build agents rarely run the same distribution as a laptop, so this release widens the set of machines atra (Atrahasis CLI) runs on.

• Alpine Linux is supported. Dedicated builds are published for Alpine and other musl based systems. They are statically linked, so they also run in minimal container images that carry no system C library at all.
• Older distributions work again. The glibc builds now run on RHEL 7 and 8, Rocky 8, Amazon Linux 2, Debian 10 and Ubuntu 18.04, alongside every current release. This matters most on build agents, which tend to run older images than developer machines.
• The right build is chosen for you. Installing through the shell script or npm detects the system and downloads the matching build, so there is nothing to select and no flag to pass.

Verified by running each build on Amazon Linux 2, Rocky 8, Debian 10 and 12, Ubuntu 20.04 and 24.04, Alpine, and minimal images without a system C library, on both x86_64 and arm64.

Homebrew installs the glibc build, since Homebrew itself requires glibc. On Alpine, install through the shell script or npm.