Fix various problems (#37129)

* Fix #37128
    * Manually tested with various cases (issue, pr) X (close, reopen)
* Fix #36792
    * Fix the comment
* Fix #36755
    * Add a "sleep 3"
* Follow up #36697
    * Clarify the "attachment uploading" problem and function call

---------

Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: TheFox0x7 <thefox0x7@gmail.com>

docker/root/etc/s6/openssh/finish

@@ -1,2 +1,8 @@
 #!/bin/bash
+# $1 = exit code of the run script, $2 = signal
+if [ "$1" -ne 0 ]; then
+  # avoid immediately restarting the sshd service, which may cause CPU 100% if the error (permission, configuration) is not fixed
+  echo "openssh failed with exit code $1 - waiting a short delay before attempting a restart"
+  sleep 3
+fi
 exit 0