Revert "Disable AuthorizedKeysFile in Docker"

This reverts commit 16504639.

changelogs/unreleased/docker-bring-back-keywrites.yml

+---
+title: Bring back the option to use the authorized keyfile in docker
+merge_request: 3388
+author:
+type: fixed

docker/assets/sshd_config

@@ -11,7 +11,7 @@ AllowUsers git
 PrintMotd no
 PrintLastLog no
 PubkeyAuthentication yes
-AuthorizedKeysFile none
+AuthorizedKeysFile %h/.ssh/authorized_keys /gitlab-data/ssh/authorized_keys
 AuthorizedKeysCommand /opt/gitlab/embedded/service/gitlab-shell/bin/gitlab-shell-authorized-keys-check git %u %k
 AuthorizedKeysCommandUser git