create risotto user

debian/eole-risotto.postinst

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+set -e
+
+if [ "$1" = configure ]; then
+    # Make sure the administrative user exists
+    if ! getent passwd risotto > /dev/null; then
+        adduser --system --home /nonexistent --no-create-home --group --gecos "User for risotto" risotto --quiet
+    fi
+fi
+
+exit 0