add ntfy - a notification service (alternative to gotify) that has a website as well for pushing notifications

could be an viable alternative to pushbullet

ntfy/docker-compose.yml

@@ -0,0 +1,22 @@
+version: '3.8'
+
+services:
+  ntfy:
+    image: binwiederhier/ntfy:latest
+    container_name: ntfy
+    restart: unless-stopped
+    command:
+      - serve
+    volumes:
+      - ./cache:/var/cache/ntfy
+      - ./ntfy-data:/etc/ntfy
+      - ./ntfy-access-db:/var/lib/ntfy
+    env_file:
+      - .env
+    networks:
+      - proxy-network
+
+networks:
+  proxy-network:
+    external: true
+