Fix Salsa CI

Andrea Bolognanirequested to merge
abologna/libvirt:fix-salsa-ci into debian/sid

The build-debian-package job currently fails due to the following error:

$ gbp export-orig --tarball-dir="${LV_WORKING_DIR}/tarballs" --pristine-tar
gbp:info: All Orig tarballs 'libvirt_6.0.0.orig.tar.xz' found at '/builds/libvirt-team/libvirt/debian/output/tarballs'
gbp:warning: Pristine-tar branch "pristine-tar" not found
gbp:info: Creating /builds/libvirt-team/libvirt/debian/output/tarballs/libvirt_6.0.0.orig.tar.xz
gbp:error: Can not find requested upstream signature for archive 'libvirt_6.0.0.orig.tar.xz' in pristine tar commit.

Creating a local pristine-tar branch beforehand solves the issue.

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