Eventually, workers will provide these variables directly
(https://bugzilla.mozilla.org/show_bug.cgi?id=1460015). But for now, this
ensures that TASKCLUSTER_ROOT_URL is set everywhere, and TASKCLUSTER_PROXY_URL
is set wherever the proxy is active.
The setup for the mach commands defaults to https://taskcluster.net for user
convenience. When the production instance's URL changes, we can simply change
that default.
This changes the docker build process propagate TASKCLUSTER_ROOT_URL into the
docker images where necessary (using %ARG), specifically to create URLs for
debian repo paths.
--HG--
extra : rebase_source : 0626ebdb66a9f4078cb75ab71be256c334297363
4a0a6eae05