ci: properly set the job name in CPU stats

Author: pietroalbini

src/ci/azure-pipelines/steps/run.yml

@@ -199,7 +199,7 @@ steps:
 # Upload CPU usage statistics that we've been gathering this whole time. Always
 # execute this step in case we want to inspect failed builds, but don't let
 # errors here ever fail the build since this is just informational.
-- bash: aws s3 cp --acl public-read cpu-usage.csv s3://$DEPLOY_BUCKET/rustc-builds/$BUILD_SOURCEVERSION/cpu-$SYSTEM_JOBNAME.csv
+- bash: aws s3 cp --acl public-read cpu-usage.csv s3://$DEPLOY_BUCKET/rustc-builds/$BUILD_SOURCEVERSION/cpu-$CI_JOB_NAME.csv
   env:
     AWS_SECRET_ACCESS_KEY: $(AWS_SECRET_ACCESS_KEY)
   condition: variables['AWS_SECRET_ACCESS_KEY']