make update-ui-version (#578)

* make update-ui-version

* make update-ui-version: default branch main

* make update-ui-version: actually checkout commit

scripts/uiupdate.sh

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+set -e
+
+if [ -z "$UI_VERSION_FILE" ]; then
+	echo "Must set UI_VERSION_FILE"; exit 1
+fi
+if [ -z "$UI_CLONE_DIR" ]; then
+	echo "Must set UI_CLONE_DIR"; exit 1
+fi
+
+shafileabs="$(pwd)/${UI_VERSION_FILE}"
+cd "${UI_CLONE_DIR}"
+V="$(git log -n1 --pretty=oneline)"
+echo "==> Setting UI version to: $V"
+
+# Write the version file.
+{
+	echo "$V"
+	echo "# This file determines the version of the UI to embed in the boundary binary."
+	echo "# Update this file by running 'make update-ui-version' from the root of this repo."
+	echo "# Set UI_COMMITISH when running the above target to update to a specific version."
+} > "${shafileabs}"