Promote aarch64 Ubuntu test_xpickle to stable

Author: StanFromIreland

master/custom/builders.py

@@ -92,6 +92,9 @@
     ("AMD64 Windows11 Refleaks", "ware-win11", Windows64RefleakBuild),
     ("AMD64 Windows Server 2022 NoGIL", "itamaro-win64-srv-22-aws", Windows64NoGilBuild),
     ("AMD64 Windows PGO NoGIL", "itamaro-win64-srv-22-aws", Windows64PGONoGilBuild),
+
+    # test_xpickle
+    ("aarch64 Ubuntu test_xpickle", "stan-aarch64-ubuntu", UnixXPickleBuild),
 ]
 
 
@@ -205,13 +208,9 @@
 
 # -- Unstable Tier-1 builders -------------------------------------------
 UNSTABLE_BUILDERS_TIER_1 = [
-
     # Ubuntu Linux AArch64
     ("aarch64 Ubuntu 24.04 BigMem", "diegorusso-aarch64-bigmem", UnixBigmemBuild),
 
-    # test_xpickle
-    ("aarch64 Ubuntu test_xpickle", "stan-aarch64-ubuntu", UnixXPickleBuild),
-
     # Linux x86-64 GCC
     # Fedora Rawhide is unstable
     ("AMD64 Fedora Rawhide", "cstratak-fedora-rawhide-x86_64", FedoraRawhideBuild),