tests: move some integration tests to gitlab CI

This also includes several modifications to tests scripts to
enable them running in gitlab CI.

test/cases/koji.sh

@@ -6,7 +6,14 @@ OSBUILD_COMPOSER_TEST_DATA=/usr/share/tests/osbuild-composer/
 # Get OS data.
 source /etc/os-release
 ARCH=$(uname -m)
-DISTRO_CODE="${DISTRO_CODE:-${ID}_${VERSION_ID//./}}"
+# This should be revisited and solved in a more sustainable way
+if [[ "$ID" == 'rhel' ]] && [[ "$VERSION_ID" == 8.3 ]]
+then
+    DISTRO_CODE="${DISTRO_CODE:-rhel_8}"
+else
+    DISTRO_CODE="${DISTRO_CODE:-${ID}_${VERSION_ID//./}}"
+fi
+
 
 # Colorful output.
 function greenprint {