Import travis caching config and JDK install from scala-dev (#273)

Import travis caching config and JDK install from scala-dev

Author: lrytz

.travis.yml

@@ -1,3 +1,7 @@
+version: ~> 1.0 # needed for imports
+
+import: scala/scala-dev:travis/default.yml
+
 language: scala
 
 scala:
@@ -42,38 +46,10 @@ matrix:
     - scala: 2.11.12
       env: SCALANATIVE_VERSION=0.4.0-M2 ADOPTOPENJDK=11
 
-before_install:
-  # adding $HOME/.sdkman to cache would create an empty directory, which interferes with the initial installation
-  - "[[ -d $HOME/.sdkman/bin ]] || rm -rf $HOME/.sdkman/"
-  - curl -sL https://get.sdkman.io | bash
-  - echo sdkman_auto_answer=true > $HOME/.sdkman/etc/config
-  - source "$HOME/.sdkman/bin/sdkman-init.sh"
-
 install:
-  - sdk install java $(sdk list java | grep -o "$ADOPTOPENJDK\.[0-9\.]*hs-adpt" | head -1)
-  - unset JAVA_HOME
-  - java -Xmx32m -version
   - git fetch --tags # get all tags for sbt-dynver
 
 before_script:
   - admin/checkCLA.sh
 
 script: sbt ci
-
-cache:
-  directories:
-    - "$HOME/.sbt/preloaded"
-    - "$HOME/.sbt/1.0/dependency"
-    - "$HOME/.sbt/boot/scala*"
-    - "$HOME/.sbt/launchers"
-    - "$HOME/.ivy2/cache"
-    - "$HOME/.cache/coursier"
-    - "$HOME/.sdkman"
-
-before_cache:
-- du -h -d 1 $HOME/.ivy2/cache
-- du -h -d 2 $HOME/.sbt/
-- find $HOME/.sbt -name "*.lock" -type f -delete
-- find $HOME/.ivy2/cache -name "ivydata-*.properties" -type f -delete
-- find $HOME/.ivy2/cache -name "*scalafix*.xml" -type f -delete
-- rm -rf $HOME/.ivy2/local