added docker support

Dockerfile

@@ -0,0 +1,21 @@
+FROM docker:cli
+
+ENV PYTHONUNBUFFERED=1
+RUN apk add --update --no-cache python3 py3-pip && ln -sf python3 /usr/bin/python
+
+COPY requirements.txt /app/requirements.txt
+RUN pip install -r /app/requirements.txt --break-system-packages --no-cache-dir
+
+COPY docker-healthcheck.py /app/docker-healthcheck.py
+RUN chmod +x /app/docker-healthcheck.py
+
+RUN apk add --no-cache cronie
+
+COPY docker-healthcheck-cron /etc/cron.d/docker-healthcheck-cron
+RUN chmod 0644 /etc/cron.d/docker-healthcheck-cron
+RUN mkdir -p /root/.cache
+RUN crontab /etc/cron.d/docker-healthcheck-cron
+
+RUN touch /var/log/docker-healthcheck.log
+
+ENTRYPOINT [ "sh", "-c", "crond & tail -f /var/log/docker-healthcheck.log" ]

docker-healthcheck-cron

@@ -0,0 +1 @@
+*/5 * * * * /app/docker-healthcheck.py /config/checks.yaml >> /var/log/docker-healthcheck.log 2>&1

docker-healthcheck.py

@@ -1,13 +1,17 @@
-# /usr/bin/env python3
+#! /usr/bin/env python3
 
 import requests
 import yaml
 import docker
 import docker.errors
+import sys
 
 
 def read_checks() -> dict:
-    with open("./checks.yaml") as f:
+    if len(sys.argv) < 2:
+        print("You need to specify a config by path")
+        sys.exit(1)
+    with open(sys.argv[1]) as f:
         checks = yaml.safe_load(f)
     return checks