Fix container builder command line.

The gcloud commands have moved.

Bug: skia:
Change-Id: I2af39ccfe0efe121766b7b0e2fe3cdb8cd8c4012
Reviewed-on: https://skia-review.googlesource.com/154040
Auto-Submit: Joe Gregorio <jcgregorio@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed