Added pid file autoremoving

Dockerfile

@@ -8,7 +8,8 @@ RUN apk add --no-cache \
     yarn \
     sqlite-dev \
     bash \
-    postgresql-dev
+    postgresql-dev \
+    python2
 
 WORKDIR /app
 
@@ -31,7 +32,11 @@ VOLUME /app/db/database
 
 RUN yarn install --check-files; bundle exec rake assets:precompile
 
+RUN apk del \
+    git \
+    python2 \
+    build-base
+
 EXPOSE 3000
 
-ENTRYPOINT ["/bin/bash"]
-CMD ["/app/entrypoint.sh"]
+CMD if [ -f /app/tmp/pids/server.pid ]; then rm -f /app/tmp/pids/server.pid; fi && cd /app && bundle exec rake 'db:migrate' && bundle exec rails server -b 0.0.0.0