Switch off Coursier when running paradox

.travis.yml

@@ -74,7 +74,8 @@ jobs:
     - stage: publish
       env: CMD="+publish"
       name: "Publish artifacts for all Scala versions"
-    - script: openssl aes-256-cbc -K $encrypted_d80875c2ae41_key -iv $encrypted_d80875c2ae41_iv -in .travis/travis_alpakka_kafka_rsa.enc -out .travis/id_rsa -d && eval "$(ssh-agent -s)" && chmod 600 .travis/id_rsa && ssh-add .travis/id_rsa && sbt -jvm-opts .jvmopts-travis '++2.13.1 docs/publishRsync'
+      # switching off Coursier as sbt-dependency-graph does not work correctly with it and is used to create the dependency graphs in the docs https://github.com/jrudolph/sbt-dependency-graph/issues/178
+    - script: openssl aes-256-cbc -K $encrypted_d80875c2ae41_key -iv $encrypted_d80875c2ae41_iv -in .travis/travis_alpakka_kafka_rsa.enc -out .travis/id_rsa -d && eval "$(ssh-agent -s)" && chmod 600 .travis/id_rsa && ssh-add .travis/id_rsa && sbt -jvm-opts .jvmopts-travis '++2.13.1 ;set ThisBuild / useCoursier := false ;docs/publishRsync'
       name: "Publish API and reference documentation"
 
 stages:

build.sbt

@@ -52,7 +52,10 @@ TaskKey[Unit]("verifyCodeStyle") := {
   }
 }
 
-addCommandAlias("verifyDocs", ";+doc ;unidoc ;docs/paradox")
+// switching off Coursier as sbt-dependency-graph does not work correctly with it
+// and is used to create the dependency graphs in the docs
+// https://github.com/jrudolph/sbt-dependency-graph/issues/178
+addCommandAlias("verifyDocs", ";set ThisBuild / useCoursier := false ;+doc ;unidoc ;docs/paradoxBrowse")
 
 val commonSettings = Def.settings(
   organization := "com.typesafe.akka",