Build On Demand arm64 should use zededa runner

Only updates to buildondemand.yml, to improve speed/reliability.

Signed-off-by: Andrew Durbin <andrewd@zededa.com>

Author: andrewd-zededa

.github/workflows/buildondemand.yml

@@ -26,7 +26,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: buildjet-4vcpu-ubuntu-2204-arm
+          - os: zededa-ubuntu-2204
             arch: arm64
           - os: zededa-ubuntu-2204
             arch: amd64