Restrict Ubuntu.1404.Arm32.Open from running against PRs (#23523)
Restrict Ubuntu.1404.Arm32.Open from running against PRs (#23523)


wtgodbe/coreclr,cshung/coreclr,krk/coreclr,krk/coreclr,wtgodbe/coreclr,krk/coreclr,cshung/coreclr,poizan42/coreclr,krk/coreclr,cshung/coreclr,poizan42/coreclr,cshung/coreclr,cshung/coreclr,poizan42/coreclr,wtgodbe/coreclr,poizan42/coreclr,wtgodbe/coreclr,poizan42/coreclr,wtgodbe/coreclr,wtgodbe/coreclr,krk/coreclr,krk/coreclr,poizan42/coreclr,cshung/coreclr