Force amd64 image for nginx
Force amd64 image for nginx

Per https://github.com/docker-library/official-images/issues/3835,
multi-arch official images are currently updated as each architecture's
builder finishes. This leads to times when the latest tags only have a
few architectures available.  Since our builds only happen on amd64,
pull nginx from the amd64 namespace specifically to avoid the problem.

Signed-off-by: Rick Altherr <8d1509bf509ebdf080240b52ca7c44886e3b1782@kc8apf.net>

SymbiFlow/prjxray,SymbiFlow/prjxray,SymbiFlow/prjxray,SymbiFlow/prjxray,SymbiFlow/prjxray