auto compile and minimal test on travis

[laszewsk]

does travis have an arm processor if not can it be compiled and a minimal test is run. THis will allow a badge of green to come up.
we lik eto use travis and not circle-ci if possible

[laszewsk]

https://docs.travis-ci.com/user/multi-cpu-architectures/

possible values

arch:
  - amd64
  - arm64 
os: linux  #

not sure if os can be raspbianos

[laszewsk]

here example on how somone wbuilds rasbian with add on. maybe we can leverage this and create precompiled image?