Add anonymous usage metrics collection (#508)

This will help us understand usage on self-hosted deployments

The collection may be disabled by using the flag --disable-anonymous-metrics or 
NETBIRD_DISABLE_ANONYMOUS_METRICS in setup.env

infrastructure_files/base.setup.env

@@ -29,6 +29,8 @@ LETSENCRYPT_VOLUMESUFFIX="letsencrypt"
 
 NETBIRD_AUTH_DEVICE_AUTH_PROVIDER="none"
 
+NETBIRD_DISABLE_ANONYMOUS_METRICS=${NETBIRD_DISABLE_ANONYMOUS_METRICS:-false}
+
 # exports
 export NETBIRD_DOMAIN
 export NETBIRD_AUTH_CLIENT_ID
@@ -55,3 +57,4 @@ export VOLUME_PREFIX
 export MGMT_VOLUMESUFFIX
 export SIGNAL_VOLUMESUFFIX
 export LETSENCRYPT_VOLUMESUFFIX
+export NETBIRD_DISABLE_ANONYMOUS_METRICS

infrastructure_files/docker-compose.yml.tmpl

@@ -48,7 +48,7 @@ services:
   #     # port and command for Let's Encrypt validation without dashboard container
   #   - 443:443
   #    command: ["--letsencrypt-domain", "$NETBIRD_DOMAIN", "--log-file", "console"]
-    command: ["--port", "443", "--log-file", "console"]
+    command: ["--port", "443", "--log-file", "console", "--disable-anonymous-metrics=$NETBIRD_DISABLE_ANONYMOUS_METRICS"]
   # Coturn
   coturn:
     image: coturn/coturn

infrastructure_files/setup.env.example

@@ -16,4 +16,7 @@ NETBIRD_LETSENCRYPT_EMAIL=""
 # if your IDP provider doesn't support fragmented URIs, configure custom
 # redirect and silent redirect URIs, these will be concatenated into your NETBIRD_DOMAIN domain.
 # NETBIRD_AUTH_REDIRECT_URI="/peers"
-# NETBIRD_AUTH_SILENT_REDIRECT_URI="/add-peers"
+# NETBIRD_AUTH_SILENT_REDIRECT_URI="/add-peers"
+
+# Disable anonymous metrics collection, see more information at https://netbird.io/docs/FAQ/metrics-collection
+NETBIRD_DISABLE_ANONYMOUS_METRICS=false