build-base: Do not set the ostree repo, it is not used

The base step generates a plain sysroot tarball and does not involve
ostree at all. To save some confusion, do not pass the ostree
repository path as an argument.

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

.gitlab-ci.yml

@@ -78,7 +78,7 @@ prepare-build-env:
     - .build
   stage: build base
   script:
-    - /opt/apertis-flatdeb/run.py --build-area=$(pwd)/flatdeb-builddir --ostree-repo=$(pwd)/flatdeb-builddir/ostree-repo --suite=${APERTIS_RELEASE} --arch=${architecture} base
+    - /opt/apertis-flatdeb/run.py --build-area=$(pwd)/flatdeb-builddir --suite=${APERTIS_RELEASE} --arch=${architecture} base
   artifacts:
     expire_in: 1d
     paths: