Use different machines for linux arm64 (dotnet#21099)

BrennanConroy · web-flow · commit 6e9bc21f3e43 · 2020-04-22T13:32:07.000-07:00
diff --git a/.azure/pipelines/ci.yml b/.azure/pipelines/ci.yml
@@ -492,6 +492,7 @@ stages:
       jobName: Linux_musl_arm64_build
       jobDisplayName: "Build: Linux Musl ARM64"
       agentOs: Linux
+      useHostedUbuntu: false
       buildScript: ./dockerbuild.sh ubuntu-alpine37
       buildArgs:
         --ci
