Add local and NetBox server notes and improve reliability

internal/config/config.go

@@ -69,7 +69,13 @@ func Load() (*Config, error) {
 	}
 
 	v.SetEnvPrefix("NETSSH")
+	v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
 	v.AutomaticEnv()
+	for _, key := range []string{"netbox.url", "netbox.token", "netbox.token_version", "resolver.strategies", "resolver.management_subnets", "resolver.interface_name", "cache.ttl", "cache.path", "ssh.default_user", "ssh.default_port", "shortcuts.domains", "shortcuts.strip_hyphens"} {
+		if err := v.BindEnv(key); err != nil {
+			return nil, err
+		}
+	}
 
 	if err := v.ReadInConfig(); err != nil {
 		if _, ok := err.(viper.ConfigFileNotFoundError); !ok {