Arr-Stack: add proxy env vars

Docker/Docker-Compose/Arr/docker-compose.yml

@@ -22,6 +22,8 @@ services:
       - FIREWALL_OUTBOUND_SUBNETS=${FIREWALL_OUTBOUND_SUBNETS}
       - SHADOWSOCKS=${SHADOWSOCKS}
       - SHADOWSOCKS_PASSWORD=${SHADOWSOCKS_PASSWORD}
+      - HTTPPROXY=${HTTPPROXY} # Enable the internal HTTP proxy
+      - HTTPPROXY_STEALTH=${HTTPPROXY_STEALTH} # Stealth mode means HTTP proxy headers are not added to your requests
     restart: unless-stopped
 
   deluge: