ci: Run go tests in github action (#2997)

This runs the make targets:

- make test
- make test-api
- make test-sdk

The go tests in the main module are split by package and run in parallel
in a matrix build with GOMAXPROCS=1. This is done primarily to work
around an issue that is only seen on the github runners.  When running
at a higher GOMAXPROCS tests that use vault instances in docker
containers start to intermitently fail with errors from vault, usually
either a 400, 403, or TLS error. It is not clear what the cause of this
is, since the same tests run fine on self hosted runners and on
CircleCI.

Co-authored-by: Sarah Thompson <sthompson@hashicorp.com>
Co-authored-by: Daniel Kimsey <daniel.kimsey@hashicorp.com>

scripts/build.sh

@@ -17,7 +17,7 @@ DIR="$( cd -P "$( dirname "$SOURCE" )/.." && pwd )"
 cd "$DIR"
 
 if [ "${CI_BUILD}x" != "x" ]; then
-    source /home/circleci/.bashrc
+    [[ -f /home/circleci/.bashrc ]] && source /home/circleci/.bashrc
 fi
 
 # Set build tags