TMT: run systemtest via make test-system-local

Reuses Makefile logic and also prints SKOPEO_BINARY value

Signed-off-by: Lokesh Mandvekar <[email protected]>

Author: lsm5

systemtest/tmt/main.fmf

@@ -10,5 +10,7 @@ adjust:
         RELEASE_TESTING: true
 
 summary: System test
-test: bash ./test.sh
+test: |
+    rpm -q containers-common skopeo skopeo-tests
+    make test-system-local
 duration: 60m