also export proxy variables in capitals

bin/duneci-runner

@@ -11,7 +11,7 @@ options=(
   -v /srv/gitlab-runner/config:/etc/gitlab-runner
 )
 
-for v in ftp_proxy http_proxy https_proxy no_proxy; do
+for v in ftp_proxy http_proxy https_proxy no_proxy FTP_PROXY HTTP_PROXY HTTPS_PROXY NO_PROXY; do
   if [ -v ${v} ]; then
     options+=(-e ${v}="${!v}")
   fi