Use docker to install the dependencies

.dockerignore

@@ -0,0 +1,3 @@
+scripts
+ipadic
+tweet.markov

.travis.yml

@@ -1,11 +1,15 @@
+sudo: required
+
+services:
+  - docker
+
 language: ruby
 
-rvm:
-  - 2.4.0
+before_install:
+  - docker build -t takuti/twitter-bot .
 
 script:
-  - bundle exec rake setup
-  - bundle exec rake
+  - docker run -it takuti/twitter-bot /bin/sh -c "bundle exec rake"
 
 branches:
   only:

Dockerfile

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+FROM ruby:2.5.0-alpine
+
+ENV APP_ROOT='/src/github.com/takuti/twitter-bot'
+
+ADD . ${APP_ROOT}
+WORKDIR ${APP_ROOT}
+
+RUN apk update && \
+  apk add --no-cache --virtual .builddeps ca-certificates wget openjdk7-jre build-base libxml2-dev libxslt-dev && \
+  update-ca-certificates && \
+  wget 'http://osdn.jp/frs/redir.php?m=jaist&f=%2Figo%2F52344%2Figo-0.4.3.jar' -O igo.jar && \
+  wget 'https://drive.google.com/uc?export=download&id=0B4y35FiV1wh7MWVlSDBCSXZMTXM' -O mecab-ipadic.tar.gz && \
+  tar zxfv mecab-ipadic.tar.gz && \
+  java -cp igo.jar net.reduls.igo.bin.BuildDic ipadic mecab-ipadic-2.7.0-20070801 EUC-JP && \
+  rm -rf igo.jar mecab-ipadic-2.7.0-20070801 mecab-ipadic.tar.gz && \
+  bundle install && \
+  apk del .builddeps
+
+EXPOSE 80
+CMD ["bundle", "exec", "rackup", "config.ru", "-p", "80", "-o", "0.0.0.0"]