Set temporary proxy for nix-daemon

reset-nix-proxy.sh

#!/usr/bin/env bash

rm /run/systemd/system/nix-daemon.service.d/proxy-override.conf
systemctl daemon-reload
systemctl restart nix-daemon

set-nix-proxy.sh

#!/usr/bin/env bash

PROXY=$1

mkdir -p /run/systemd/system/nix-daemon.service.d/
cat << EOF >/run/systemd/system/nix-daemon.service.d/proxy-override.conf  
[Service]
Environment="http_proxy=$PROXY"
Environment="https_proxy=$PROXY"
Environment="all_proxy=$PROXY"
EOF
systemctl daemon-reload
systemctl restart nix-daemon