Try art 5 on jammy

Bug: b/417870524
Change-Id: I03f71d3fba7424dd85e61d532f9f4eab572cb69e
diff --git a/infra/config/global/generated/cr-buildbucket.cfg b/infra/config/global/generated/cr-buildbucket.cfg
index 233773f..d70e472 100644
--- a/infra/config/global/generated/cr-buildbucket.cfg
+++ b/infra/config/global/generated/cr-buildbucket.cfg
@@ -969,7 +969,7 @@
       swarming_tags: "vpython:native-python-wrapper"
       dimensions: "cpu:x86-64"
       dimensions: "normal:true"
-      dimensions: "os:Ubuntu-24.04"
+      dimensions: "os:Ubuntu-22.04"
       dimensions: "pool:luci.r8.ci"
       exe {
         cipd_package: "infra_internal/recipe_bundles/chrome-internal.googlesource.com/chrome/tools/build"
@@ -1007,7 +1007,7 @@
       swarming_tags: "vpython:native-python-wrapper"
       dimensions: "cpu:x86-64"
       dimensions: "normal:true"
-      dimensions: "os:Ubuntu-24.04"
+      dimensions: "os:Ubuntu-22.04"
       dimensions: "pool:luci.r8.ci"
       exe {
         cipd_package: "infra_internal/recipe_bundles/chrome-internal.googlesource.com/chrome/tools/build"
diff --git a/infra/config/global/main.star b/infra/config/global/main.star
index 5a25451..ae2935d 100755
--- a/infra/config/global/main.star
+++ b/infra/config/global/main.star
@@ -168,7 +168,7 @@
 
 default_timeout = time.hour * 6
 
-def get_dimensions(windows = False, internal = False, archive = False, noble=False):
+def get_dimensions(windows = False, internal = False, archive = False, noble=False, jammy=False):
     # We use the following setup:
     #   windows -> always windows machine
     #   internal -> always internal, single small, machine
@@ -183,6 +183,8 @@
     else:
         if noble:
             dimensions["os"] = "Ubuntu-24.04"
+        elif jammy:
+            dimensions["os"] = "Ubuntu-22.04"
         else:
             dimensions["os"] = "Ubuntu-20.04"
     if internal:
@@ -408,7 +410,7 @@
 r8_tester_with_default(
     "linux-android-5-noble",
     ["--dex_vm=5.1.1", "--all_tests", "--command_cache_dir=/tmp/ccache"],
-     dimensions = get_dimensions(noble=True),
+     dimensions = get_dimensions(jammy=True),
 )
 
 r8_tester_with_default(