Update /etc/environment on microk8s host with proxy environment variables with:
HTTPS_PROXY=http://squid.internal:3128
HTTP_PROXY=http://squid.internal:3128
NO_PROXY=10.0.0.0/8,192.168.0.0/16,127.0.0.1,172.16.0.0/16,temporal
https_proxy=http://squid.internal:3128
http_proxy=http://squid.internal:3128