only 1 job for tests

Author: psumbera

.github/actions/solaris/action.yml

@@ -79,7 +79,7 @@ runs:
           export STACK_LIMIT_DEFAULTS_CHECK=1
           PATH=/usr/gnu/bin:/usr/bin \
           sapi/cli/php run-tests.php \
-            -P -q -j2 \
+            -P -q -j1 \
             -g FAIL,BORK,LEAK,XLEAK \
             --no-progress \
             --offline \