ci: macos: align sysinfo_script to other tasks.

Author: Justin Pryzby <pryzby@telsasoft.com>
Discussion: https://postgr.es/m/20220203035827.GG23027@telsasoft.com

Author: anarazel

.cirrus.yml

@@ -233,8 +233,9 @@ task:
 
   sysinfo_script: |
     id
-    export
+    uname -a
     ulimit -a -H && ulimit -a -S
+    export
 
   setup_cores_script:
     - mkdir ${HOME}/cores