Add devscripts package for debuild command

- Required for DEB package generation in release pipeline
- debuild command was not found in previous run

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

qt6-after/qt6-migrated-legatus/new_docker_build.sh

@@ -299,6 +299,7 @@ APT_PACKAGES=(
   debhelper
   dpkg-dev
   fakeroot
+  devscripts
 )
 
 # INTERFACE libraries (header-only) are built automatically as dependencies