Disable gbp post-build hook

debian/changelog

@@ -4,6 +4,7 @@ apt (2.0.1+devuan1) unstable; urgency=medium
   * Remove systemd dependencies
   * Introduce and remove again cron script
   * Adjust Vcs and Origin in debian/control
+  * Disable gbp post-build hook
 
  -- Andreas Messer <andi@bastelmap.de>  Thu, 02 Apr 2020 18:59:06 +0200
 

debian/gbp.conf

@@ -2,7 +2,9 @@
 ; we need a preexport here
 ;preexport = ./prepare-release pre-export
 prebuild = ./prepare-release pre-build
-postbuild = ./prepare-release post-build
+# Disabled for devuan: this makes source package build fail since
+# it requires extra packages to be installed even for source only build
+;postbuild = ./prepare-release post-build
 
 # repo cofig for devuan
 debian-branch = suites/unstable