build the war file with travis.

automatically add the generated war to github releases.
split the docker build in stages to run in parallel and only if the build succeeded.

.travis.yml

@@ -2,22 +2,47 @@ language: java
 
 sudo: required
 
+jdk:
+    - openjdk8
+
 services:
     - docker
 
-after_success:
-  - docker login  -u $DOCKER_LOGIN -p $DOCKER_PASSWORD
-  - if [ "$TRAVIS_BRANCH" == "master" ]; then
+stages:
+  - build
+  - name: docker-push
+    if: branch = master
 
-    docker build --pull -t plantuml/plantuml-server:jetty -f Dockerfile.jetty . ;
-    docker build --pull -t plantuml/plantuml-server:tomcat -f Dockerfile.tomcat . ;
-    docker tag plantuml/plantuml-server:jetty plantuml/plantuml-server:latest ;
-
-    docker push plantuml/plantuml-server:tomcat;
-    docker push plantuml/plantuml-server:jetty;
-    docker push plantuml/plantuml-server:latest;
-
-    docker build --pull -t plantuml/plantuml-server:armv8a -f Dockerfile.armv8a . ;
-    docker push plantuml/plantuml-server:armv8a;
-
-    fi
+jobs:
+    include:
+        - stage: build
+          name: war
+          script: mvn --batch-mode --define java.net.useSystemProxies=true package
+          before_deploy: cp target/plantuml.war target/plantuml-${TRAVIS_BRANCH}.war
+          deploy:
+              provider: releases
+              api_key: "$GITHUB_TOKEN"
+              file: "target/plantuml-${TRAVIS_BRANCH}.war"
+              skip_cleanup: true
+              on:
+                  tags: true
+        - stage: docker-push
+          name: jetty
+          script: >
+              docker login  -u $DOCKER_LOGIN -p $DOCKER_PASSWORD
+              docker build --pull -t plantuml/plantuml-server:jetty -f Dockerfile.jetty . ;
+              docker tag plantuml/plantuml-server:jetty plantuml/plantuml-server:latest ;
+              docker push plantuml/plantuml-server:jetty;
+              docker push plantuml/plantuml-server:latest;
+        - stage: docker-push
+          name: tomcat
+          script: >
+              docker login  -u $DOCKER_LOGIN -p $DOCKER_PASSWORD
+              docker build --pull -t plantuml/plantuml-server:tomcat -f Dockerfile.tomcat . ;
+              docker push plantuml/plantuml-server:tomcat;
+        - stage: docker-push
+          name: armv8a
+          script: >
+              docker login  -u $DOCKER_LOGIN -p $DOCKER_PASSWORD
+              docker build --pull -t plantuml/plantuml-server:armv8a -f Dockerfile.armv8a . ;
+              docker push plantuml/plantuml-server:armv8a;