Fix cffi installation in Dockerfile (#364)

The Python cffi package requires the libc, libffi and openssl
development packages, as well as gcc to compile it.

1 files changed, 2 insertions, 1 deletions

diff --git a/Dockerfile b/Dockerfile
index fbc0f4a..cbe4af6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,7 @@
 FROM python:3.6-alpine
 
-RUN mkdir /ihatemoney &&\
+RUN apk add gcc libc-dev libffi-dev openssl-dev &&\
+    mkdir /ihatemoney &&\
     mkdir -p /etc/ihatemoney &&\
     pip install --no-cache-dir gunicorn pymysql