Stop any running dokku-installer processes

They will cease to function regardless of whether the package has been purged or not

debian/postrm

@@ -5,6 +5,10 @@ readonly DOKKU_ROOT="${DOKKU_ROOT:-/home/dokku}"
 readonly DOKKU_LIB_ROOT="${DOKKU_LIB_PATH:-/var/lib/dokku}"
 
 main() {
+  if [[ -f /etc/systemd/system/dokku-installer.conf ]] || [[ -f /etc/init/dokku-installer.conf ]]; then
+    service dokku-installer stop || true
+  fi
+
   rm -f /etc/init/dokku-installer.conf
   rm -f /etc/init/dokku-redeploy.conf
   rm -f /etc/systemd/system/dokku-installer.conf