add healthchecks

healthchecks/README.md

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+healthchecks
+============
+
+[Healthchecks][1] is a cron job monitoring service. It listens for HTTP
+requests and email messages ("pings") from your cron jobs and scheduled tasks
+("checks"). When a ping does not arrive on time, Healthchecks sends out alerts.
+
+## up and running
+
+```bash
+$ mkdir -m 777 data
+$ docker-compose up -d
+$ docker-compose exec healthchecks bash
+>>> ./manage.py migrate
+>>> ./manage.py createsuperuser
+    Email address: admin@easypi.duckdns.org
+    Password: ******
+    Password (again): ******
+    Superuser created successfully.
+>>> exit
+$ curl http://127.0.0.1:8000
+```
+
+[1]: https://github.com/healthchecks/healthchecks

healthchecks/docker-compose.yml

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+version: "3.8"
+services:
+  healthchecks:
+    image: healthchecks/healthchecks
+    ports:
+      - "8000:8000"
+    volumes:
+      - ./data:/data
+    environment:
+      - DEBUG=False
+      - DB_NAME=/data/hc.db
+    restart: unless-stopped