.asf.yaml: Add required "repository" field. (apache#14499)

Our new .asf.yaml is not getting picked up because custom_subjects
must include "repository".

.asf.yaml

@@ -7,23 +7,23 @@ github:
   # Attempt to make the auto-generated github emails more easily readable in email clients.
   # Configuration adapted from https://github.com/apache/plc4x/blob/develop/.asf.yaml.
   custom_subjects:
-    new_pr: "[PR] {title}"
-    close_pr: "Re: [PR] {title}"
-    comment_pr: "Re: [PR] {title}"
-    diffcomment: "Re: [PR] {title}"
-    merge_pr: "Re: [PR] {title}"
-    new_issue: "[I] {title}"
-    comment_issue: "Re: [I] {title}"
-    close_issue: "Re: [I] {title}"
-    catchall: "[GH] {title}"
-    new_discussion: "[D] {title}"
-    edit_discussion: "Re: [D] {title}"
-    close_discussion: "Re: [D] {title}"
-    close_discussion_with_comment: "Re: [D] {title}"
-    reopen_discussion: "Re: [D] {title}"
-    new_comment_discussion: "Re: [D] {title}"
-    edit_comment_discussion: "Re: [D] {title}"
-    delete_comment_discussion: "Re: [D] {title}"
+    new_pr: "[PR] {title} ({repository})"
+    close_pr: "Re: [PR] {title} ({repository})"
+    comment_pr: "Re: [PR] {title} ({repository})"
+    diffcomment: "Re: [PR] {title} ({repository})"
+    merge_pr: "Re: [PR] {title} ({repository})"
+    new_issue: "[I] {title} ({repository})"
+    comment_issue: "Re: [I] {title} ({repository})"
+    close_issue: "Re: [I] {title} ({repository})"
+    catchall: "[GH] {title} ({repository})"
+    new_discussion: "[D] {title} ({repository})"
+    edit_discussion: "Re: [D] {title} ({repository})"
+    close_discussion: "Re: [D] {title} ({repository})"
+    close_discussion_with_comment: "Re: [D] {title} ({repository})"
+    reopen_discussion: "Re: [D] {title} ({repository})"
+    new_comment_discussion: "Re: [D] {title} ({repository})"
+    edit_comment_discussion: "Re: [D] {title} ({repository})"
+    delete_comment_discussion: "Re: [D] {title} ({repository})"
 
 notifications:
   commits: [email protected]