Package onboard K1 separately with a private portable installer

plugins/xgrids-k1/packaging/postinst

@@ -0,0 +1,16 @@
+#!/bin/sh
+set -eu
+case "$1" in
+  configure)
+    if ! getent passwd mission-core-k1 >/dev/null; then
+      adduser --system --home /var/lib/mission-core-k1 --no-create-home --disabled-login --ingroup mission-core-node mission-core-k1
+    fi
+    /usr/bin/python3 -I /usr/lib/mission-core-node/k1_prepare.py
+    /usr/lib/mission-core-node/prepare-k1-profile
+    if [ -d /run/systemd/system ]; then
+      systemctl daemon-reload
+      systemctl enable mission-core-k1.service
+      systemctl restart mission-core-k1.service
+    fi
+    ;;
+esac