Update setup-linux.sh

Author: metascroy

.ci/scripts/setup-linux.sh

@@ -21,7 +21,3 @@ else
   install_executorch --use-pt-pinned-commit
 fi
 build_executorch_runner "${BUILD_TOOL}" "${BUILD_MODE}"
-
-if [[ "${GITHUB_BASE_REF:-}" == *main* || "${GITHUB_BASE_REF:-}" == *gh* ]]; then
-  do_not_use_nightly_on_ci
-fi