remove armv8a docker build. it doesn't work. looks like it never worked and no docker image was ever pushed to the docker registry. failing commands were ignored silently by travis.

.travis.yml

@@ -40,9 +40,3 @@ jobs:
               - 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

Dockerfile.armv8a

@@ -1,20 +0,0 @@
-FROM arm64v8/ubuntu:16.04
-
-RUN apt-get update && apt-get install -y --no-install-recommends maven openjdk-8-jdk graphviz fonts-wqy-zenhei && rm -rf /var/lib/apt/lists/*
-
-COPY pom.xml /app/
-COPY src /app/src/
-
-ENV MAVEN_CONFIG=/app/.m2
-WORKDIR /app
-RUN mvn package
-
-# chmod required to ensure any user can run the app
-RUN mkdir /app/.m2 && chmod -R a+w /app
-EXPOSE 8080
-ENV HOME /app
-
-CMD java -Djetty.contextpath=/ -jar target/dependency/jetty-runner.jar target/plantuml.war
-
-# To run with debugging enabled instead
-#CMD java -Dorg.eclipse.jetty.util.log.class=org.eclipse.jetty.util.log.StdErrLog -Dorg.eclipse.jetty.LEVEL=DEBUG -Djetty.contextpath=/ -jar target/dependency/jetty-runner.jar target/plantuml.war