Disable coverage tracking on buildkite for now

Author: staticfloat

.buildkite/test_sandbox.yml

@@ -9,8 +9,10 @@ steps:
           pre-command: apt install -y gcc sudo
       # Run standard tests, possibly building a local sandbox
       - JuliaCI/julia-test#v1: ~
-      - JuliaCI/julia-coverage#v1:
-          codecov: true
+
+     # Disabled for now, pending tokenless uploads, or integration of a codecov token
+     #- JuliaCI/julia-coverage#v1:
+     #    codecov: true
     env:
       SANDBOX_BUILD_LOCAL_SANDBOX: "${LOCAL_SANDBOX}"
       # Because `binfmt_misc` can't be manipulated within a sandbox, we