Actually run tests

Author: fredrikekre

.buildkite/runtests.yml

@@ -5,7 +5,8 @@ steps:
       - JuliaCI/julia#v1:
           version: "nightly"
     command: |
-      julia --version
+      julia --color=yes --project=.ci -e 'using Pkg; Pkg.instantiate()'
+      julia --color=yes --project=.ci .ci/create_sysimage_and_run_tests.jl
     agents:
       queue: "julia"
       os: "${OS?}"