Remove proxy variables

(déjà setup dans la config du runner)

Dockerfile

@@ -4,11 +4,6 @@ COPY files/sources.list /etc/apt/sources.list
 
 ARG DEBIAN_FRONTEND=noninteractive
 
-ENV http_proxy="http://proxy.runner.iiens.net:3128"
-ENV https_proxy="http://proxy.runner.iiens.net:3128"
-ENV HTTP_PROXY="http://proxy.runner.iiens.net:3128"
-ENV HTTPS_PROXY="http://proxy.runner.iiens.net:3128"
-
 RUN apt-get update
 RUN apt-get install -y apt-utils
 RUN apt-get upgrade -y