Squashed commit of the following:

commit 2826022
Author: Maxfield Lehman <_@maxfieldlehman.com>
Date:   Tue Oct 2 06:30:29 2018 -0700

    Prevent container from erroneously exiting immediately.

commit 4583639
Author: Maxfield Lehman <_@maxfieldlehman.com>
Date:   Tue Oct 2 06:12:16 2018 -0700

    Kill sshd on SIGTERM instead of waiting for docker stop timeout.

Author: ofilla

start.sh

@@ -1,5 +1,12 @@
 #!/bin/sh
 
+_term() {
+  echo "Caught SIGTERM signal!"
+  kill -TERM "$child" 2>/dev/null
+}
+
+trap _term SIGTERM
+
 ssh-keygen -A
 
 # If there are some public keys in keys folder
@@ -20,5 +27,7 @@ if [ "$(ls -A /git-server/repos/)" ]; then
   find /git-server/repos -type d -exec chmod g+s '{}' +
 fi
 
-# -D flag avoids executing sshd as a daemon
-/usr/sbin/sshd -D
+/usr/sbin/sshd -D &
+
+child=$!
+wait "$child"