[ci] Run check_podspecs on arm Mac bots (flutter#5885)

Fixes flutter/flutter#141493

Author: jmagman

.ci.yaml

@@ -1062,9 +1062,7 @@ targets:
         }
 
   ### iOS+macOS tasks ###
-  # TODO(stuartmorgan): Move this to ARM once google_maps_flutter has ARM
-  # support. `pod lint` makes a synthetic target that doesn't respect the
-  # pod's arch exclusions, so fails to build.
+  # TODO(jmagman): Remove when repo_checks is no longer in bringup.
   - name: Mac_x64 check_podspecs
     recipe: packages/packages
     timeout: 30
@@ -1073,6 +1071,15 @@ targets:
       version_file: flutter_master.version
       target_file: macos_check_podspecs.yaml
 
+  - name: Mac_arm64 repo_checks
+    recipe: packages/packages
+    timeout: 30
+    bringup: true
+    properties:
+      add_recipes_cq: "true"
+      version_file: flutter_master.version
+      target_file: macos_check_podspecs.yaml
+
   ### macOS desktop tasks ###
   # macos-platform_tests builds all the packages on ARM, so this build is run
   # on Intel to give us build coverage of both host types.