Revert "rename configFile to auth in the job"

This reverts commit e9c3e397436221528312c0d3b291ae5a12862ed2.

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Revert "refactor build job to know only configFile"

This reverts commit b9731bccf2b2cc8c06ef8bdb41f72ca4791e63db.

Conflicts:
	server/server.go

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Merge pull request #5665 from vieux/fix_auth_issue

Fix auth issue