make update-ui-version (#578)

* make update-ui-version

* make update-ui-version: default branch main

* make update-ui-version: actually checkout commit

scripts/uiclone.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+set -e
+
+if [ -z "$UI_COMMITISH" ]; then
+	echo "Must set UI_COMMITISH"; exit 1
+fi
+
+if [ -z "$UI_CLONE_DIR" ]; then
+	echo "Must set UI_CLONE_DIR"; exit 1
+fi
+
+if [ -z "$UI_VERSION_FILE" ]; then
+	echo "Must set UI_CLONE_DIR"; exit 1
+fi
+
+tempdir="$(dirname "${UI_CLONE_DIR}")"
+
+mkdir -p "${tempdir}"
+echo "*" > "${tempdir}/.gitignore"
+
+if ! [ -d "${UI_CLONE_DIR}/.git" ]; then
+	git clone https://github.com/hashicorp/boundary-ui "${UI_CLONE_DIR}"
+fi
+
+cd "${UI_CLONE_DIR}"
+git reset --hard
+git fetch origin "${UI_COMMITISH}"
+git checkout "${UI_COMMITISH}"