TMT: run systemtest via make test-system-local

Reuses Makefile logic and also prints SKOPEO_BINARY value

Signed-off-by: Lokesh Mandvekar <lsm5@redhat.com>

systemtest/tmt/main.fmf

@@ -10,5 +10,9 @@ adjust:
         RELEASE_TESTING: true
 
 summary: System test
-test: bash ./test.sh
+test: |
+    rpm -q containers-common skopeo skopeo-tests
+    # If these tests are to be run anywhere else, TMT can fetch
+    # them using the URL and git ref, so git commands should work.
+    make -C $(git rev-parse --show-toplevel) test-system-local
 duration: 60m

systemtest/tmt/test.sh

@@ -1,13 +0,0 @@
-#!/usr/bin/env bash
-
-set -exo pipefail
-
-uname -r
-
-rpm -q \
-    bats \
-    containers-common \
-    skopeo \
-    skopeo-tests \
-
-bats /usr/share/skopeo/test/system