remove debconf questions on purge

debian/changelog

@@ -7,6 +7,7 @@ gitlab (8.8.2+dfsg-1) unstable; urgency=medium
   * Check if nginx site configuration directory is present before copying
     (Closes: #821085)
   * Symlink /run/gitlab/cache to /var/lib/gitlab/cache (or /run gets filled up)
+  * Remove debconf db on purge
 
  -- Pirate Praveen <praveen@debian.org>  Thu, 02 Jun 2016 22:27:15 +0530
 

debian/postrm

@@ -64,6 +64,14 @@ case "$1" in
       test -n "${gitlab_yml}" && ucfr --purge gitlab ${gitlab_yml}
     fi
 
+    # purge debconf questions
+    if [ -e /usr/share/debconf/confmodule ]; then
+      # Source debconf library.
+      . /usr/share/debconf/confmodule
+      # Remove my changes to the db.
+      db_purge
+    fi
+
     # cleanup complete
     exit 0