Add new PR automation

.github/scripts/validate.py

@@ -0,0 +1,27 @@
+import re
+import os
+
+
+def validate_title(title: str) -> int:
+    if not title.startswith("Add "):
+        return 42
+
+    appid = title[len("Add ") :].strip()
+    regex = r"^[A-Za-z_][\w\-]*$"
+    split = appid.split(".")
+
+    if (
+        len(split) > 255
+        or len(split) < 3
+        or not all(re.match(regex, sp) for sp in split)
+    ):
+        return 42
+
+    return 0
+
+
+if __name__ == "__main__":
+    title = os.environ["PR_TITLE"]
+    exit_code = validate_title(title)
+    print(f"EXIT_CODE={exit_code}")
+    exit(0)