Add automated commit / tag

Signed-off-by: Knut Ahlers <knut@ahlers.me>

Makefile

@@ -20,11 +20,14 @@ official-tests: build
 
 test: hadolint official-tests
 
-update: teamspeaki_version_update test
+update: teamspeak_version_update test tag
 
-teamspeaki_version_update:
+teamspeak_version_update:
 	docker run --rm -i \
 		-v "$(CURDIR):$(CURDIR)" \
 		-w "$(CURDIR)" \
 		python:3-alpine \
 		sh -c "pip install -r patcher/requirements.txt && python3 patcher/index.py"
+
+tag:
+	bash ./patcher/tag.sh

patcher/tag.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+set -euo pipefail
+
+ver=$(grep -Eo 'TEAMSPEAK_VERSION=([0-9.]+)' Dockerfile | cut -d '=' -f 2)
+
+[ -n "${ver}" ] || {
+	echo "No version found"
+	exit 1
+}
+
+git commit -m "Teamspeak Server ${ver}" Dockerfile
+git tag "${ver}"