acct-group/dendrite: Add system group for net-matrix/dendrite

This package was copied and adopted from “antons-matrix-overlay”:
- upstream's repo:   https://gitlab.com/anton.molyboha.group/gentoo/overlays/matrix
- github.com mirror: https://github.com/gentoo-mirror/antons-matrix-overlay

Signed-off-by: Nils Freydank <nils.freydank@posteo.de>

acct-group/dendrite/dendrite-0.ebuild

@@ -0,0 +1,9 @@
+# Copyright 2020-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI="8"
+
+inherit acct-group
+
+DESCRIPTION="Group for matrix homerserver dendrite"
+ACCT_GROUP_ID=-1

acct-group/dendrite/metadata.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<name>Nils Freydank</name>
+		<email>holgersson@posteo.de</email>
+	</maintainer>
+</pkgmetadata>