feat: apt's proxy on a Proxmox VE node (NetOrk/netork#1397)

The node is Debian: AptProxyMixin gives it get_package_proxy(),
get_package_proxy_report(), check_package_proxy() and the fix
configure_package_proxy(), as on any Debian host. Logged in as root, the
transports are the exec path; the file is written without an exit inside
_rc's braces, which would end the shell before the status (see #30).

Requires napalm-device-types 4.22.0; version 0.7.0.

napalm_proxmox/driver.py

@@ -35,6 +35,7 @@ from typing import Any
 logger = logging.getLogger(__name__)
 
 from napalm_device_types import (
+    AptProxyMixin,
     EnsurePackageMixin,
     FingerprintRule,
     HostStatusMixin,
@@ -99,6 +100,7 @@ class ProxmoxDriver(
     LicenseMixin,
     SnmpAgentMixin,
     EnsurePackageMixin,
+    AptProxyMixin,
     HypervisorDriver,
 ):
     """NAPALM driver for Proxmox VE nodes."""