Adding grs to the overlay.

app-portage/grs/Manifest

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+DIST ISO-1.tar.gz 2887967 BLAKE2B 0ae9d9c4078974316d6865a8601705f7c69c8305d8401835bfa544d14a90b3688ea6b881a1c07bcb969fe2b15f210d05f114ebaf3af5ba6f1ae3705d395f1603 SHA512 50bd9bcaa3d1900763936beb4801fd9e5cb963e39d51c39c9cc9a8d160469db1b0c6fffae01bbb5d5d5c6d4e42d84a6c499c465bbdd964835c2d190785eed52d
+DIST sergiotarxz-v0.1.tar.gz 36442 BLAKE2B b66f65c5680d843faf5bd7d04d8d10d17e765906f3c88df1a617973fc2691b8db5a030894085925128d0d1a16a9d52ed3e68dc312a592e68f2b85df12f5f362a SHA512 0beb3d1d39c0e708f257369205ad97d9a014dd4b11bafc77eda56efe020505047f4469c50fa44b768d5df363b7c9a5d23cad1092e384163d4c8781b9e916b78c
+EBUILD grs-0.1.ebuild 1383 BLAKE2B 47367315104a1f01dea5f230c9b805ddf00e6105cec6986dcb7825a579215ef09eab4d28f7eb672680183d8cdba2f7dea07dcd98cd3a6d42e1f540c98a3c7c12 SHA512 8c7dc2b23de0bbd1fa85a80f16b89eb0fc1f540d03734f061aee52ee77a71c11c9c7d53cbc8cccf2f909f8cb0dfa07e1d32c61dfce40ce5d166150e3f7730f8b

app-portage/grs/grs-0.1.ebuild

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+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI="7"
+PYTHON_COMPAT=( python3_{8,9} )
+DISTUTILS_USE_SETUPTOOLS=no
+
+inherit distutils-r1 linux-info
+
+ISO="ISO-1.tar.gz"
+
+if [[ ${PV} == *9999 ]] ; then
+	EGIT_REPO_URI="https://github.com/sergiotarxz/grss.git"
+	SRC_URI="https://dev.gentoo.org/~blueness/${PN}/${ISO}"
+	inherit git-r3
+else
+	SRC_URI="https://github.com/sergiotarxz/grss/archive/refs/tags/sergiotarxz-v${PV}.tar.gz
+	https://dev.gentoo.org/~blueness/${PN}/${ISO}"
+	KEYWORDS="amd64 arm arm64 x86"
+fi
+
+DESCRIPTION="Suite to build Gentoo Reference Systems"
+HOMEPAGE="https://dev.gentoo.org/~blueness/grs"
+
+LICENSE="GPL-2"
+SLOT="0"
+IUSE="server"
+
+DEPEND=""
+RDEPEND="
+	sys-apps/portage
+	server? (
+		app-arch/tar[xattr]
+		app-cdr/cdrtools
+		app-crypt/md5deep
+		dev-libs/libcgroup
+		dev-vcs/git
+		net-misc/rsync
+		sys-fs/squashfs-tools
+		|| (
+			sys-kernel/genkernel
+			sys-kernel/genkernel-next
+		)
+	)"
+
+pkg_setup() {
+	if use server; then
+		local CONFIG_CHECK="~CGROUPS"
+		local ERROR_CGROUPS="WARNING: grsrun requires CONFIG_CGROUPS enabled in the kernel."
+		linux-info_pkg_setup
+	fi
+}
+
+src_install() {
+	distutils-r1_src_install
+	echo "CONFIG_PROTECT=\"/etc/grs/systems.conf\"" > "${T}"/20grs
+	doenvd "${T}"/20grs
+	if use server; then
+		mkdir "${D}"/usr/share/${PN}
+		cp "${DISTDIR}"/${ISO} "${D}"/usr/share/${PN}
+	fi
+}