Export GitHub token for run-windows-benchmarks.sh

Author: igoragoli

.gitlab/benchmarks/microbenchmarks.yml

@@ -92,6 +92,7 @@ run-benchmarks:
     - !reference [.dd-octo-sts-setup, before_script]
   script:
     - git clone --branch $BP_INFRA_BENCHMARKING_PLATFORM_BRANCH https://gitlab-ci-token:${CI_JOB_TOKEN}@gitlab.ddbuild.io/DataDog/benchmarking-platform platform
+    - export GITHUB_TOKEN=$(cat /tmp/github-token)
     - ./platform/steps/run-windows-benchmarks.sh
   after_script:
     # Future improvement: Ideally, should be in a script.