Tweak circleci config to try and fix artifact upload
Tweak circleci config to try and fix artifact upload

It appears that the `$GOPATH` in `working_directory` is being treated as a literal
`GOPATH` at least when processing the `state_artifacts.path`. Inlining it seems
to have worked, at the cost of some duplication.

Signed-off-by: Ian Campbell <a8db091655a7f47ecb9c39a2d278e9662e440dc0@docker.com>

deitch/linuxkit,justincormack/linuxkit,linuxkit/linuxkit,YuPengZTE/linuxkit,djs55/linuxkit,konstruktoid/linuxkit,yankcrime/linuxkit,YuPengZTE/linuxkit,JohnnyLeone/linuxkit,djs55/linuxkit,djs55/linuxkit,furious-luke/linuxkit,furious-luke/linuxkit,konstruktoid/linuxkit,furious-luke/linuxkit,deitch/linuxkit,furious-luke/linuxkit,YuPengZTE/linuxkit,furious-luke/linuxkit,rn/linuxkit,JohnnyLeone/linuxkit,rn/linuxkit,linuxkit/linuxkit,djs55/linuxkit,justincormack/linuxkit,yankcrime/linuxkit,JohnnyLeone/linuxkit,justincormack/linuxkit,rn/linuxkit,deitch/linuxkit,rn/linuxkit,yankcrime/linuxkit,JohnnyLeone/linuxkit,yankcrime/linuxkit,justincormack/tool,konstruktoid/linuxkit,djs55/linuxkit,linuxkit/linuxkit,rn/linuxkit,deitch/linuxkit,justincormack/linuxkit,deitch/linuxkit,yankcrime/linuxkit,yankcrime/linuxkit,linuxkit/linuxkit,konstruktoid/linuxkit,konstruktoid/linuxkit,justincormack/linuxkit,konstruktoid/linuxkit,justincormack/linuxkit,YuPengZTE/linuxkit,YuPengZTE/linuxkit,linuxkit/linuxkit,JohnnyLeone/linuxkit,YuPengZTE/linuxkit