docs: fix docker run cmd + add how to quickly login

README.md

@@ -26,10 +26,10 @@
 $ docker run -it \
     --name jumpbox \
     -v $(pwd)/jumpbox:/var/lib/jumpbox \
-    -e "ROOT_AUTHORIZED_KEYS=/var/lib/jumpbox/authorized_keys"
-    -e "HOSTKEYS=/var/lib/jumpbox/ssh_host_ed25519_key;/var/lib/jumpbox/ssh_host_rsa_key"
-    -e "USERADD=jumpbox:1000:1000:/bin/bash"
-    -e "GROUPADD=jumpbox:1000"
+    -e "ROOT_AUTHORIZED_KEYS=/var/lib/jumpbox/authorized_keys" \
+    -e "HOSTKEYS=/var/lib/jumpbox/ssh_host_ed25519_key;/var/lib/jumpbox/ssh_host_rsa_key" \
+    -e "USERADD=jumpbox:1000:1000:/bin/bash" \
+    -e "GROUPADD=jumpbox:1000" \
     -p 1022:22 \
     pommib/jumpbox:latest
 ```
@@ -53,3 +53,18 @@ services:
       USERADD: jumpbox:1000:1000:/bin/bash
       GROUPADD: jumpbox:1000
 ```
+
+## Login as root
+
+```
+$ ssh -l root 127.0.0.1 -p 1022
+```
+
+## Login as jumpbox
+
+To login as user jumpbox, make sure `/home/jumpbox` is a mounted volume
+containing `.ssh/authorized_keys` containing your public key.
+
+```
+$ ssh -l jumpbox 127.0.0.1 -p 1022
+```