add new image to .travis.yml

Author: japaric

.travis.yml

@@ -116,6 +116,8 @@ matrix:
       if: branch = auto
     - env: IMAGE=dist-various-2 DEPLOY=1
       if: branch = auto
+    - env: IMAGE=dist-various-3 DEPLOY=1
+      if: branch = auto
     - env: IMAGE=dist-aarch64-linux DEPLOY=1
       if: branch = auto
     - env: IMAGE=dist-android DEPLOY=1