[indico-web] worker: Install cryptography

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit db724719e41f8077e06df744fce4995026218dfa
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Tue Dec 10 14:16:37 2019 +0100

    worker: Install cryptography

 worker/Dockerfile | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/worker/Dockerfile b/worker/Dockerfile
index 0212d9f..23356e9 100644
--- a/worker/Dockerfile
+++ b/worker/Dockerfile
@@ -5,14 +5,15 @@ ENV pip="${INDICO_VIRTUALENV}/bin/pip"
 
 USER root
 RUN apt-get update && \
-    apt-get -y install libpq-dev python-virtualenv gcc gettext libldap2-dev libsasl2-dev && \
+    apt-get -y install libpq-dev python-virtualenv gcc gettext \
+        libldap2-dev libsasl2-dev libssl-dev && \
     apt-get clean
 
 RUN virtualenv ${INDICO_VIRTUALENV}
 RUN ${pip} install --upgrade pip setuptools && \
     ${pip} install uwsgi raven && \
-    ${pip} install indico indico-plugins indico-plugin-payment-stripe \
-        python-ldap certifi
+    ${pip} install indico indico-plugins python-ldap \
+        indico-plugin-payment-stripe cryptography
 RUN chgrp -R 0 /opt/indico
 
 FROM python:2.7-buster