tests: Do not use fedora.repo for the test build

The tmt systems have a fedora.repo present which is including packages
that are not built for RHEL10 and can cause the test build to fail.

Resolves: RHEL-40021

tests/scripts/run_tests.sh

@@ -7,7 +7,8 @@ if [ ! -e /usr/share/lorax/templates.d/80-rhel/ ]; then
 fi
 
 # Gather up the list of system repo files and use them for lorax
-REPOS=$(for f in /etc/yum.repos.d/*repo; do echo -n "--repo $f "; done)
+# Skip fedora.repo
+REPOS=$(find /etc/yum.repos.d/ -maxdepth 1 -type f -name '*\.repo' ! -name 'fedora.repo' -exec echo -n "--repo {} " \;)
 if [ -z "$REPOS" ]; then
     echo "No system repos found"
     exit 1