app: Make it works without volume mounting

This fixes https://github.com/mattermost/mattermost-docker/pull/32#issuecomment-226408765.

.travis.yml

@@ -4,9 +4,17 @@ services:
     - docker
 
 before_install:
-    - docker-compose up -d
+    - docker build -t mattermost-prod-db db
+    - docker build -t mattermost-prod-app app
+
+install:
+    - eval $BUILD
     - sleep 10
 
+env:
+    - BUILD="docker-compose up -d"
+    - BUILD="docker run -d --name db mattermost-prod-db && sleep 5 && docker run -d --link db -p 80:80 --name app mattermost-prod-app"
+
 script:
     - curl -sSf http://localhost > /dev/null
 

app/Dockerfile

@@ -5,9 +5,10 @@ RUN mkdir -p /mattermost/data
 
 RUN curl https://releases.mattermost.com/3.0.2/mattermost-team-3.0.2-linux-amd64.tar.gz | tar -xvz
 
+RUN rm /mattermost/config/config.json
 COPY config.template.json /
-COPY docker-entry.sh /
 
+COPY docker-entry.sh /
 RUN chmod +x /docker-entry.sh
 ENTRYPOINT ["/docker-entry.sh"]