Update readme

README.md

@@ -6,9 +6,11 @@ It will run the ssh daemon on port 2222, expect a folder with the repos in /repo
 
 For example it can be run with podman:
 ```
-podman run -user user \
-           -p 2222:2222 \
+podman run -p 2222:2222 \
            -e "KEY=ssh-ed25519 <key> user" \
            -v '/path/to/repo:/repo' \
            borg
 ```
+
+
+*Warning*: This image contains the ssh private keys inside, do not redistribute it or you will leak them.