jobs: master-builds: simtrace2: pass '--publish'

Kevin would like to upload simtrace firmware to ftp.osmocom.org from master
builds. To facilitate, add '--publish' arg, like in master-osmo-gsm-manuals (to
distinguish and not upload from gerrit verification jobs).

Change-Id: I93435aa6f39e9a072754011ae7696b10315f6092

jobs/master-builds.yml

@@ -326,7 +326,12 @@
 
       - osmocom-bb
       - osmo-sysmon
-      - simtrace2
+
+      - simtrace2:
+          cmd: >
+           # keep first line with less indent to preserve newlines
+            ./contrib/jenkins.sh --publish
+
       - gapk
 
       - rtl-sdr: