playground: fix docker image of of goprevplay

Change-Id: I909658e0d73af3199582b7e2000348529dff5796
Reviewed-on: https://go-review.googlesource.com/c/playground/+/367895
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
diff --git a/deploy/deploy_goprev.json b/deploy/deploy_goprev.json
index 31ba056..5af6e52 100644
--- a/deploy/deploy_goprev.json
+++ b/deploy/deploy_goprev.json
@@ -23,7 +23,7 @@
       "name": "gcr.io/cloud-builders/docker",
       "args": [
         "push",
-        "gcr.io/$PROJECT_ID/playground"
+        "gcr.io/$PROJECT_ID/playground-goprev"
       ]
     },
     {