__user add alpine support

cdist/conf/type/__user/manifest

@@ -0,0 +1,32 @@
+#!/bin/sh -e
+#
+# 2019 Nico Schottelius (nico-cdist at schottelius.org)
+#
+# This file is part of cdist.
+#
+# cdist is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# cdist is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with cdist. If not, see <http://www.gnu.org/licenses/>.
+#
+#
+# Manage users.
+
+os=$(cat "$__global/explorer/os")
+
+case "$os" in
+    alpine)
+        __package shadow
+        ;;
+    *)
+        :
+        ;;
+esac