cli: correct image tag, add update recipe

bin/cli

@@ -1,6 +1,6 @@
 #!/usr/bin/env -S just --working-directory . --justfile
 
-image := "ghcr.io/jswank/alpine-cli:latest"
+image := "ghcr.io/jswank/alpine-cli:edge"
 n := "alpine-cli"
 
 # Invoke the 'run' recipe
@@ -14,8 +14,8 @@ default: run
 #   cli run
 #
 # Run an ephemeral container.
-@run:
-  podman run -ti --userns=keep-id --rm {{image}}
+@run run_args="":
+  podman run -ti --userns=keep-id --rm {{run_args}} {{image}}
 
 # Usage: persist
 #
@@ -59,6 +59,10 @@ save i=image:
 # Remove a running container, and run the default recipe
 @restart: clean default
 
+# Pull the latest published image
+@update:
+  podman pull {{image}}
+
 # Display this listing. Detailed help is available with 'help recipe_name'.
 help recipe="help":
   #!/bin/sh