fixup! URGH ARGH

Dockerfile

@@ -4,6 +4,9 @@ ARG DEBIAN_FRONTEND=noninteractive
 FROM registry.gitlab.apertis.org/infrastructure/obs-proxy/obs-proxy:add-logging-chunked
 LABEL maintainer Andrej Shadura <andrew.shadura@collabora.co.uk>
 ENV LC_ALL=C.UTF-8
+RUN apt-get update \
+ && apt-get install -y python3 \
+    python3-pip python3-xdg ssl-cert
 
 COPY . /tmp/proxy
 RUN cd /tmp/proxy && python3 setup.py install