benchmark

Add ubuntu-14.04 build and test workflow (#1131)

* Add ubuntu-14.04 build and test workflow

* avoid '.' in job name

* no need for fail fast

* fix workflow syntax

* install some stuff

* better compiler installations

* update before install

* just say yes

* trying to match up some paths

* Difference between runner and github context in container?

* Try some judicious logging

* cmake 3.5+ required

* specific compiler versions

* need git for googletest

* Disable testing on old compilers

* disable testing properly