[autoroll] Add ephemeral-storage requests for rollers which don't use persistent disk

Change-Id: I5164d7100c899497eebcbd90dc8f869988fc0af8
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/565799
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
diff --git a/autoroll/go/autoroll-config-converter/autoroll-be.yaml.template b/autoroll/go/autoroll-config-converter/autoroll-be.yaml.template
index b2a66d6..50d2422 100644
--- a/autoroll/go/autoroll-config-converter/autoroll-be.yaml.template
+++ b/autoroll/go/autoroll-config-converter/autoroll-be.yaml.template
@@ -96,6 +96,9 @@
             requests:
               memory: "{{.kubernetes.memory}}"
               cpu: {{.kubernetes.cpu}}
+              {{- if not .kubernetes.disk}}
+              ephemeral-storage: '32M'
+              {{- end}}
           readinessProbe:
             httpGet:
               path: /healthz