Building images requires installing gcloud

[hwright]

On a fresh clone of the git repository, on a clean vm of one's choice, building a distroless image requires first installing the gcloud commandline tool. It seems that print-workspace-status.sh is using gcloud for something:

$ bazel build python2.7:python27
INFO: Found 1 target...
ERROR: Process exited with status 127: Process exited with status 127.
./print-workspace-status.sh: line 8: gcloud: command not found
Target //python2.7:python27 failed to build
Use --verbose_failures to see the command lines of failed build steps.
INFO: Elapsed time: 107.303s, Critical Path: 0.05s
$

This would appear to be an extraneous dependency. We should consider removing it.

[r2d4]

This sounds good to me. It's used to get the current project_id, which is only used for the publish step.