Define Rust environment and toolchain

config/wireguard-admin.example.toml

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+# Copy this file to wireguard-admin.toml beside the wireguard-admin executable.
+# Relative paths are resolved from that executable directory, never from the
+# process working directory. This example uses documentation-only addresses.
+
+interface_name = "wg0"
+server_config_path = "etc/wireguard/wg0.conf"
+client_source_directory = "clients"
+server_endpoint = "vpn.example.invalid:51820"
+ipv4_allocation_range = "192.0.2.0/24"
+ipv6_allocation_range = "2001:db8:1::/64"
+dns_addresses = ["192.0.2.1", "2001:db8:1::1"]
+systemd_unit = "wg-quick@wg0.service"
+restart_timeout_seconds = 30
+
+# Optional. Defaults to Backup beside the executable. The application stores
+# current data in <data_root>/data and archives in <data_root>/archives.
+# data_root = "Backup"