gitlab-ci.yml: Only run s390x tests that are really solid

The "smp" test is unreliable with the QEMU that is installed on the
s390x box. Let's better only run a well-defined set of tests that
should work all the time (unless there are new regressions of course).

Signed-off-by: Thomas Huth <thuth@redhat.com>
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 13c798f..b7c0571 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -163,7 +163,10 @@
  script:
   - ./configure --arch=s390x
   - make -j$(nproc)
-  - ACCEL=kvm ./run_tests.sh | tee results.txt
+  - ACCEL=kvm ./run_tests.sh
+      selftest-setup intercept emulator sieve sthyi skey diag10 diag308 pfmf
+      cmm vector gs iep cpumodel diag288 stsi sclp-1g sclp-3g css skrf sie
+      | tee results.txt
   - grep -q PASS results.txt && ! grep -q FAIL results.txt
  only:
   variables: