build_packages: Dump env for goma.

The goma team is currently transitioning between backends. Having
the environment variables for a run help them to debug certain issues.
Add the env dump when run goma is enabled for now to provide the info.

BUG=chromium:1031259
TEST=cq passes

Change-Id: I3419353ea326e235c1c5402f2f0348a13e65c3a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/1958700
Tested-by: Alex Klein <saklein@chromium.org>
Commit-Queue: Alex Klein <saklein@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed