Add void-packages change detection script

.github/changed_templates.sh

@@ -0,0 +1,46 @@
+#!/bin/sh
+#Copyright (c) 2008-2020 Juan Romero Pardines and contributors
+# Copyright (c) 2017-2025 The Void Linux team and contributors
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# changed_templates.sh
+
+tip="$(git rev-list -1 --parents HEAD)"
+case "$tip" in
+	# This is a merge commit, pick last parent
+	*" "*" "*) tip="${tip##* }" ;;
+	# This is a non-merge commit, pick itself
+	*)         tip="${tip%% *}" ;;
+esac
+
+base="$(git merge-base origin/HEAD "$tip")"
+
+echo "$base $tip" >/tmp/revisions
+
+/bin/echo -e '\x1b[32mChanged packages:\x1b[0m'
+git diff-tree -r --no-renames --name-only --diff-filter=AM \
+	"$base" "$tip" \
+	-- 'srcpkgs/*/template' |
+	cut -d/ -f 2 |
+	tee detected_templates |
+	sed "s/^/  /" >&2