Add sudo for copying /var/log/fai/*

Bug: 372162211
Test: N/A
Change-Id: I3365a131c7158bcc32262ac5363901a256eb8392
diff --git a/build/debian/kokoro/gcp_ubuntu_docker/build.sh b/build/debian/kokoro/gcp_ubuntu_docker/build.sh
index ebf8296..c1524dd 100644
--- a/build/debian/kokoro/gcp_ubuntu_docker/build.sh
+++ b/build/debian/kokoro/gcp_ubuntu_docker/build.sh
@@ -9,4 +9,4 @@
 tar czvS -f ${KOKORO_ARTIFACTS_DIR}/images.tar.gz image.raw
 
 mkdir -p ${KOKORO_ARTIFACTS_DIR}/logs
-cp -r /var/log/fai/* ${KOKORO_ARTIFACTS_DIR}/logs || true
+sudo cp -r /var/log/fai/* ${KOKORO_ARTIFACTS_DIR}/logs || true