bin/pick-ui: use venv wrapper

Signed-off-by: Eric Engestrom <eric@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24367>
(cherry picked from commit b13473efe9)

.pick_status.json

@@ -31,7 +31,7 @@
         "description": "bin/pick-ui: use venv wrapper",
         "nominated": false,
         "nomination_type": null,
-        "resolution": 4,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": null
     },

bin/pick-ui.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+set -eu
+
+this_dir=$(dirname -- "$(readlink -f -- "${BASH_SOURCE[0]}")")
+readonly this_dir
+
+exec \
+  "$this_dir/python-venv.sh" \
+  "$this_dir/pick/requirements.txt" \
+  "$this_dir/pick-ui.py" "$@"

bin/pick/requirements.txt

@@ -0,0 +1,2 @@
+attrs==23.1.0
+urwid==2.1.2