fix keep-userns for systemd service generation

active/podman_minecraft/minecraft.md

@@ -16,13 +16,22 @@ Find and replace minecraft with the name of the service.
 ### Create the minecraft user
 
 ```bash
+# As root
 useradd minecraft
 
 su - minecraft
+# Set the minecraft user password
+passwd
+# Generate an SSH key for this user. We don't need it now, but it might be handy later.
 ssh-keygen
+# Exit back to root.
 exit
+
+# Optional, copy your authorized_keys into the minecraft user's home dir so you can SSH in.
 cp ~/.ssh/authorized_keys /home/minecraft/.ssh/authorized_keys
 chown minecraft:minecraft /home/minecraft/.ssh/authorized_keys
+
+# Allow user systemd services to run after you've died (logged out).
 loginctl enable-linger $(id -u minecraft)
 ```
 
@@ -42,6 +51,7 @@ Create a folder called `quadlets` in your podman_minecraft project.
 # Generate the systemd service
 podman run \
 --security-opt label=disable \
+--userns keep-id \
 --rm \
 -v $(pwd)/active/podman_minecraft:/compose \
 -v $(pwd)/active/podman_minecraft/quadlets:/quadlets \