Run only in ZTS builds

Author: arnaud-lb

.github/actions/freebsd/action.yml

@@ -112,4 +112,6 @@ runs:
             -d zend_extension=opcache.so
 
           export TLSC=$(pwd)/ext/opcache/jit/tls/zend_jit_tls_x86_64.c
-          ./ext/opcache/jit/tls/testing/test.sh
+          if sapi/cli/php -r 'exit(!PHP_ZTS);'; then
+            ./ext/opcache/jit/tls/testing/test.sh
+          fi