feat: add initial kener instance (uptime monitoring)

kener/.env.example

@@ -0,0 +1,3 @@
+KENER_SECRET_KEY=your_secret_key_here
+ORIGIN=http://localhost:3000
+TZ=Etc/UTC

kener/compose.yaml

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+services:
+  kener:
+    image: rajnandan1/kener:latest
+    container_name: kener
+    ports:
+      - 3000:3000/tcp
+    environment:
+      - KENER_SECRET_KEY=${KENER_SECRET_KEY?Kener requires a secret key}
+      - ORIGIN=${ORIGIN:-http://localhost:3000}
+      - TZ:${TZ:-Etc/UTC}
+    volumes:
+      - db:/app/database
+      - uploads:/app/uploads
+    networks:
+      - proxy
+volumes:
+  db:
+  uploads:
+networks:
+  proxy:
+    external: true