[master] 11d0f63d1 First attempt at a Travis CI witness job

[Dridi Boukelmoune]

commit 11d0f63d146c4dda99e65650d23ea7e274a327e6
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Tue Mar 10 10:48:47 2020 +0100

    First attempt at a Travis CI witness job
    
    At this point I have no idea what I'm doing and no motivation to learn
    further YAML so I'll do something I hate: trigger a CI build and resume
    what I was working on until it completes.
    
    Refs 0c645dbf093f

diff --git a/.travis.yml b/.travis.yml
index 5632b3c33..bf31b432b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -44,6 +44,8 @@ jobs:
       before_script:
         - ./autogen.sh
         - ./configure
+    - <<: *test-linux
+      script: make -j8 witness
     - <<: *test-linux
       stage: sanitizers
       addons: