add docker tests and fix sorting

mail4one/poputils.py

@@ -118,8 +118,7 @@ def get_mails_list(dirpath: Path) -> list[MailEntry]:
 
 
 def set_nid(entries: list[MailEntry]):
-    entries.sort(reverse=True, key=lambda e: e.c_time)
-    entries = sorted(entries, reverse=True, key=lambda e: e.c_time)
+    entries.sort(reverse=True, key=lambda e: (e.c_time, e.uid))
     for i, entry in enumerate(entries, start=1):
         entry.nid = i
 

mail4one/smtp.py

@@ -50,7 +50,7 @@ class MyHandler(AsyncMessage):
                 gen = BytesGenerator(fp, policy=email.policy.SMTP)
                 gen.flatten(m)
             for mbox in all_mboxes:
-                shutil.copy2(temp_email_path, self.mails_path / mbox / 'new')
+                shutil.copy(temp_email_path, self.mails_path / mbox / 'new')
 
 
 def protocol_factory_starttls(mails_path: Path,