tools/create-toolbox: Add convenience script

The script is a thin wrapper around `toolbox create`, mainly to
avoid the tedious image names. In addition, it allows us to
ensure that the container includes a matching mutter version.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2713>

tools/toolbox/create-toolbox.sh

@@ -0,0 +1,80 @@
+#!/bin/sh
+# vi: sw=2 ts=4
+
+set -e
+
+TOOLBOX_IMAGE=registry.gitlab.gnome.org/gnome/gnome-shell/toolbox
+DEFAULT_NAME=gnome-shell-devel
+
+usage() {
+  cat <<-EOF
+	Usage: $(basename $0) [OPTION…]
+
+	Create a toolbox for gnome-shell development
+
+	Options:
+	  -n, --name=NAME         Create container as NAME instead of the
+	                          default "$DEFAULT_NAME"
+	  -v, --version=VERSION   Create container for stable version VERSION
+	                          (like 44) instead of the main branch
+	  -h, --help              Display this help
+
+	EOF
+}
+
+die() {
+  echo "$@" >&2
+  exit 1
+}
+
+toolbox_run() {
+  toolbox run --container $NAME "$@"
+}
+
+TEMP=$(getopt \
+  --name $(basename $0) \
+  --options 'n:v:h' \
+  --longoptions 'name:' \
+  --longoptions 'version:' \
+  --longoptions 'help' \
+  -- "$@")
+
+eval set -- "$TEMP"
+unset TEMP
+
+NAME=$DEFAULT_NAME
+
+while true; do
+  case "$1" in
+    -n|--name)
+      NAME="$2"
+      shift 2
+    ;;
+
+    -v|--version)
+      VERSION="$2"
+      shift 2
+    ;;
+
+    -h|--help)
+      usage
+      exit 0
+    ;;
+
+    --)
+      shift
+      break
+    ;;
+  esac
+done
+
+TAG=${VERSION:-main}
+
+if podman container exists $NAME; then
+  die "Container $NAME" already exists
+fi
+
+podman pull $TOOLBOX_IMAGE:$TAG
+
+toolbox create --image $TOOLBOX_IMAGE:$TAG $NAME
+toolbox_run update-mutter