Move deploy config to .env with wg1/51821 defaults for server+client coexistence

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

docker-compose.yml

@@ -11,21 +11,17 @@ services:
     devices:
       - /dev/net/tun:/dev/net/tun
     ports:
-      - "51820:51820/udp"
+      - "${WG_PORT:-51821}:${WG_PORT:-51821}/udp"
       - "127.0.0.1:8000:8000/tcp"
     environment:
-      WG_INTERFACE: wg0
+      WG_INTERFACE: ${WG_INTERFACE:-wg1}
       WG_HOST: ${WG_HOST:?set WG_HOST to your public IP or domain}
-      WG_PORT: "51820"
-      WG_SUBNET: 10.8.0.0/24
-      WG_DNS: 1.1.1.1
+      WG_PORT: ${WG_PORT:-51821}
+      WG_SUBNET: ${WG_SUBNET:-10.8.0.0/24}
+      WG_DNS: ${WG_DNS:-8.8.8.8}
       ADMIN_USERNAME: ${ADMIN_USERNAME:-admin}
-      ADMIN_PASSWORD: ${ADMIN_PASSWORD:?set ADMIN_PASSWORD}
-      SECRET_KEY: ${SECRET_KEY:?set SECRET_KEY to a long random string}
+      ADMIN_PASSWORD: ${ADMIN_PASSWORD:?set ADMIN_PASSWORD in .env}
+      SECRET_KEY: ${SECRET_KEY:?set SECRET_KEY in .env}
     volumes:
-      - wg-admin-data:/opt/wireguard-admin/data
-      - wg-config:/etc/wireguard
-
-volumes:
-  wg-admin-data:
-  wg-config:
+      - ./wg-admin-data:/opt/wireguard-admin/data
+      - ./wg-config:/etc/wireguard