Bug 1908775 - Create a gecko-3/b-linux-gcp-aarch64 worker pool

Author: gabrielbusta

worker-pools.yml

@@ -236,6 +236,9 @@ pools:
     owner: [email protected]
     variants:
       - pool-group: gecko-1
+      - pool-group: gecko-2
+      - pool-group: gecko-3
+        chain-of-trust: trusted
     email_on_error: true
     provider_id:
       by-chain-of-trust:
@@ -250,6 +253,10 @@ pools:
       # the "t2a" machine series is only available in the "a", "b", and "f" zones of the "us-central1" region.
       regions: [us-central1]
       image: monopacker-ubuntu-2204-wayland-arm64
+      security:
+        by-chain-of-trust:
+          trusted: trusted
+          default:
       instance_types:
         - minCpuPlatform: Ampere Altra
           disks: