We likely need a pristine tarball, use pristine tar to list it first.

debian/.gitlab-ci.yml

@@ -14,13 +14,12 @@ before_script:
   - apt -yqq update
   - apt -y install build-essential devscripts pristine-tar
   - apt -y install pkg-config libpci-dev libusb-1.0-0-dev libftdi1-dev meson
-  - apt -y install git-buildpackage --no-install-recommends
+  - apt -y install git-buildpackage --no-install-recommends 
   
 git-buildpackage-run:
   stage: build
   script:
-    - git checkout pureos/byzantium
-    - gbp buildpackage --git-debian-branch=pureos/byzantium --git-tag
+    - pristine-tar list
   tags:
     - byzantium