[CI] setting up a CI with EC2 backend (#78)
* ci wip
* pytest
* no capacity - try w/o region
* python3?
* it wants region
* different region?
* different region doesn't work
* whoami
* switch to ubuntu user
* no switch
* wip
* wip
* wip
* wip
* wip
* wip
* wip
* wip
* wip
* wip
* wip
* wip
* wip
* wip
* wip
* revert
* revert
* wip
* try 3 different subnets
* move deps into requirements.txt
* move deps into requirements.txt
* switch to us-east-1
* wip
* wip
* may be good
* branch
* add a guide
* ci doc
* concurrency doesn't work
