Add docker-compose.yml and replace .env with example

.env

@@ -1,2 +0,0 @@
-API_URL=
-WEBHOOK=

.env.example

@@ -0,0 +1,2 @@
+API_URL="https://toho.mnz.gg/api/v1/ping"
+WEBHOOK="https://discord.com/api/webhooks/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"

docker-compose.yml

@@ -0,0 +1,7 @@
+version: "3.7"
+
+services:
+  monitor:
+    image: node:20-alpine
+    command: npm run monitor
+    restart: unless-stopped