[periodic-trigger] pushk --use-temp-checkout

Change-Id: Iae130f29fa2bb63c86db18d4feacd1305efd666c
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/291839
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
diff --git a/periodic-trigger/Makefile b/periodic-trigger/Makefile
index aaf1ba2..f813bd0 100644
--- a/periodic-trigger/Makefile
+++ b/periodic-trigger/Makefile
@@ -11,4 +11,4 @@
 
 .PHONY: push
 push: release pushk
-	pushk --message="$(MESSAGE)" periodic-trigger
+	pushk --message="$(MESSAGE)" --use-temp-checkout periodic-trigger