container: make 'container remove' cli command slightly more useful

Usually, when your system is up and running properly, you want to clean
up anything unused from your previous experiments.  This change alllows
that by calling the interactive 'podman image prune -a -f' command from
the CLI command 'container remove all'

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

board/common/rootfs/usr/sbin/container

@@ -584,7 +584,7 @@ usage:
   container [opt] cmd [arg]
 
 options:
-  -a, --all                Show all, of something
+  -a, --all                Show all, do all, remove all, of something
       --dns NAMESERVER     Set nameserver(s) when creating a container
       --dns-search LIST    Set host lookup search list when creating container
       --cap-add CAP        Add capability to unprivileged container
@@ -624,7 +624,7 @@ commands:
   list    [image | oci]    List names (only) of containers, images, or OCI archives
   load    [NAME | URL] NM  Load OCI tarball fileNAME or URL to image NM
   locate                   Find container that currently owns '--net IFNAME'
-  remove   IMAGE           Remove an (unused) container image
+  remove  [IMAGE]          Remove an image, or prune unused images including OCI archives
   restart [network] NAME   Restart a (crashed) container or container(s) using network
   run      NAME [CMD]      Run a container interactively, with an optional command
   save     IMAGE FILE      Save a container image to an OCI tarball FILE[.tar.gz]
@@ -876,7 +876,14 @@ case $cmd in
 	podman pull "$@"
 	;;
     remove)
-	podman rmi $all $force -i "$1"
+	if [ -n "$all" ]; then
+	    log "Removing all OCI archives from $DOWNLOADS directory ..."
+	    find "${DOWNLOADS:?}" -mindepth 1 -exec rm -rf {} +
+	    log "Removing all unused container images ..."
+	    podman image prune $all $force
+	else
+	    podman rmi $force -i "$1"
+	fi
 	;;
     run)
 	img=$1

src/klish-plugin-infix/xml/containers.xml

@@ -102,9 +102,14 @@
   </COMMAND>
 
   <COMMAND name="remove" help="Remove a container image from local storage">
-    <PARAM name="name" ptype="/IMAGES" help="Image name" />
+    <SWITCH name="optional" min="0">
+      <PARAM name="name" ptype="/IMAGES" help="Image name" />
+    </SWITCH>
     <ACTION sym="script" in="tty" out="tty" interrupt="true">
-      doas container remove $KLISH_PARAM_name
+      if [ -n "$KLISH_PARAM_name" ]; then
+        all=-a
+      fi
+      doas container $all remove $KLISH_PARAM_name
     </ACTION>
   </COMMAND>