Pass vault token from worker

Author: JoshMock

.buildkite/run-tests

@@ -18,7 +18,7 @@ run_qaf() {
     -e EC_ENV \
     -e EC_REGION \
     -e EC_PROJECT_NAME \
-    -e VAULT_TOKEN \
+    -e "VAULT_TOKEN=$(cat ~/.vault-token)" \
     -e BUILDKITE \
     -v "$(pwd)/cloud.json:/root/.elastic/cloud.json" \
     docker.elastic.co/employees/dolaru/qaf:latest \