Switch cloudbuild_docker.yaml newline from folded to literal style. (#632)
Switch cloudbuild_docker.yaml newline from folded to literal style. (#632)

Also add quotes to docker step for style consistency.

Co-authored-by: Jay Hou <c77a5be5c3c62b45a3bd0620f51a63a0fc6540a5@google.com>
google/trillian-examples,google/trillian-examples,google/trillian-examples,google/trillian-examples,google/trillian-examples,google/trillian-examples