jenkins/build-config.jpl: drop use of tee()

Some buf reports indicate that parallel + tee()
doesn't quite work reliably:

https://issues.jenkins-ci.org/browse/JENKINS-63504
https://issues.jenkins-ci.org/browse/JENKINS-37575

Test if moving tee to shell removes the never ending
jobs observed in tf-m-nightly builds.

Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Change-Id: I3d5cc972d0b9d6073d66278a771bf000497bbc33
diff --git a/jenkins/build-config.jpl b/jenkins/build-config.jpl
index 365b608..397e6f4 100644
--- a/jenkins/build-config.jpl
+++ b/jenkins/build-config.jpl
@@ -95,9 +95,7 @@
   try {
     verify = 1
     stage("Build") {
-      tee("build.log") {
-        sh "tf-m-ci-scripts/run-build.sh"
-      }
+      sh "tf-m-ci-scripts/run-build.sh 2>&1 | tee build.log"
     }
     stage("Post") {
       archiveArtifacts 'trusted-firmware-m/build/install/**,build.log'