Verify image healthcheck before publishing from Gitea

scripts/verify_image_healthcheck.py

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+"""Fail publication if the built image lost its automatic healthcheck."""
+import json
+import sys
+
+images = json.load(sys.stdin)
+healthcheck = images[0].get("Config", {}).get("Healthcheck") or {}
+expected = ["CMD", "python", "-m", "epg.healthcheck"]
+if healthcheck.get("Test") != expected:
+    sys.exit("Image healthcheck missing or incorrect; refusing publication")
+print("Image healthcheck verified")