Merge pull request #9516 from SethTisue/bionic-for-spec-only

fix publishing: only use bionic in spec job, not main job

.travis.yml

@@ -1,8 +1,7 @@
 version: ~> 1.0 # needed for imports
 import: scala/scala-dev:travis/default.yml
 
-dist: bionic  # for generating spec PDF; see #7432
-
+dist: xenial  # GPG stuff breaks on bionic; scala/scala-dev#764
 language: scala
 
 stages:
@@ -100,6 +99,8 @@ jobs:
 
       - stage: build
         name: language spec (Jekyll)
+        # wkhtmltopdf requires libssl1.1, which we can't install on xenial
+        dist: bionic
         language: ruby
         install:
           - ruby -v