Cache go packages to speed up builds in poudriere

Dear all,

is there a way that go (that is used by ports in poudriere) can cache go 
packages?
I ask because if I e.g. make a new port for devel/gitaly which uses go 
and I make a test build, it takes about 30-45 minutes to download the 
packages.

And it seems that it is downloading the packages again and again with 
each testbuild.

As I have a really slow internet connection here, this is really very 
time-consuming.

Thanks a lot for any tips.

Gruß
Matthias

-- 

"Programming today is a race between software engineers striving to
build bigger and better idiot-proof programs, and the universe trying to
produce bigger and better idiots. So far, the universe is winning." --
Rich Cook