add graphviz for rails-erd.

1 files changed, 1 insertions, 0 deletions

diff --git a/Dockerfile b/Dockerfile
index 90f8496..b0a5d1f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,6 +13,7 @@ RUN apt-get install -y nodejs
 RUN npm install npm -g
 RUN npm install phantomjs-prebuilt -g
 RUN apt-get install -y postgresql-client
+RUN apt-get install -y graphviz
 
 RUN mkdir -p /app
 WORKDIR /app