feat: add coredns mysql image build and updater

scripts/update.py

@@ -0,0 +1,24 @@
+# SPDX-License-Identifier: MIT
+# Copyright (C) 2026 Bryan Joshua Pedini
+
+import json
+import re
+import urllib.request
+from pathlib import Path
+
+
+def fetch(url):
+    request = urllib.request.Request(url, headers={"Accept": "application/vnd.github+json", "User-Agent": "coredns-mysql-updater"})
+    with urllib.request.urlopen(request, timeout=30) as response:
+        return json.load(response)
+
+
+release = fetch("https://api.github.com/repos/coredns/coredns/releases/latest")
+plugin = fetch("https://api.github.com/repos/cloud66-oss/coredns_mysql/commits/HEAD")
+tag = release["tag_name"]
+revision = plugin["sha"]
+if not re.fullmatch(r"v[0-9]+\.[0-9]+\.[0-9]+", tag):
+    raise SystemExit(f"Unexpected CoreDNS release: {tag}")
+if not re.fullmatch(r"[0-9a-f]{40}", revision):
+    raise SystemExit("Unexpected plugin revision")
+Path("versions.env").write_text(f"COREDNS_VERSION={tag[1:]}\nMYSQL_PLUGIN_REV={revision}\n")