Treat Fedora spins as Fedora

[pboling]

There are official spins of Universal Blue, Fedora Atomic Desktop based images, such as Aurora, Bazzite, BlueFin, and uCore.
Many people, myself included, have created further spins on top of those.

All of these are fedora, which is reported by /etc/os-release's ID_LIKE, while the NAME reports the specific release, which should rarely need to be considered by a project like ruby-build.

Some relevant lines from my /etc/os-release

NAME="Aurora"
ID=aurora
ID_LIKE="fedora"
VERSION_ID=42
PLATFORM_ID="platform:f42"

I think we can use this to better target fixes for Fedora-based systems.

cat /etc/os-release

NAME="Aurora"
VERSION="latest-42.20250623.1 (Kinoite)"
RELEASE_TYPE=stable
ID=aurora
ID_LIKE="fedora"
VERSION_ID=42
VERSION_CODENAME="Stargazer"
PLATFORM_ID="platform:f42"
PRETTY_NAME="Aurora (Version: latest-42.20250623.1 / FROM Fedora Kinoite 42)"
ANSI_COLOR="0;38;2;60;110;180"
LOGO=fedora-logo-icon
CPE_NAME="cpe:/o:universal-blue:aurora:42"
DEFAULT_HOSTNAME="aurora"
HOME_URL="https://getaurora.dev/"
DOCUMENTATION_URL="https://docs.getaurora.dev"
SUPPORT_URL="https://github.com/ublue-os/aurora/issues/"
BUG_REPORT_URL="https://github.com/ublue-os/aurora/issues/"
SUPPORT_END=2026-05-13
VARIANT="Kinoite"
VARIANT_ID=aurora-dx-hwe
OSTREE_VERSION='latest-42.20250623.1'
BUILD_ID="97252ff"
IMAGE_ID="aurora-dx-hwe"

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