ci: clean tarball from rpm build artifacts

.gitlab-ci.yml

@@ -58,6 +58,8 @@ build:el7:
     - python setup.py sdist
     - rpmbuild -tb dist/ligo-common-*.tar.gz
     - mv ~/rpmbuild/RPMS/*/python*-ligo-common-*.rpm dist/el7/
+  after_script:
+    - rm -rf dist/*tar.gz
 
 .build:debian: &build_debian
   <<: *build