Improve concurrent building speed
As per @avonbertoldi's request at https://gitlab.com/gitlab-org/fleeting/fleeting-plugin-aws/-/merge_requests/7#note_1282253694
When one runs
make all
on an empty$GOPATH
, each target tries to download the dependencies, which turns out to be slower than downloading them once up front.
Edited by Tomasz Maczukin