devops: add ubuntu-22.04-arm bot (#39171)

Author: dgozman

.github/workflows/tests_primary.yml

@@ -43,6 +43,9 @@ jobs:
           - os: ubuntu-22.04
             node-version: 24
             browser: chromium
+          - os: ubuntu-22.04-arm
+            node-version: 20
+            browser: chromium
     runs-on: ${{ matrix.os }}
     permissions:
       id-token: write   # This is required for OIDC login (azure/login) to succeed