Install python-rsa package.

ghaering · ghaering · commit 76114f068efe · 2015-01-28T08:34:18.000+01:00
The rsa module is needed for using CloudFront functionality
(*cloudfronts3* configuration flavour).
diff --git a/Dockerfile b/Dockerfile
@@ -16,6 +16,7 @@ RUN apt-get update \
         python-pip \
 # Install deps for backports.lzma (python2 requires it)
         python-dev \
+        python-rsa \
         libssl-dev \
         liblzma-dev \
         libevent1-dev \
