chore: add release automation script

_release.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+
+set -euo pipefail
+
+declare -r VERSION=${1:-}
+declare -r MESSAGE=${2:-"Release ${VERSION}"}
+declare -r TAGBRANCH=main
+declare -r RELEASEBRANCH=dev
+declare CURRENTBRANCH=""
+
+showHelp() {
+	echo "Usage: ./_release.sh <version> [message]"
+}
+
+cleanup() {
+	if [ -n "${CURRENTBRANCH}" ] && [ "${CURRENTBRANCH}" != "$(git rev-parse --abbrev-ref HEAD)" ]; then
+		git checkout "${CURRENTBRANCH}" >/dev/null 2>&1 || true
+	fi
+}
+
+trap cleanup EXIT
+
+if [ "${VERSION}" == "" ]; then
+	showHelp
+	echo ""
+	echo "No version provided!"
+	exit 1
+fi
+
+CURRENTBRANCH=$(git rev-parse --abbrev-ref HEAD)
+
+if [ "${CURRENTBRANCH}" != "${RELEASEBRANCH}" ]; then
+	echo "You are not on the ${RELEASEBRANCH} branch!"
+	echo "Use ${RELEASEBRANCH} branch to make a release!"
+	exit 1
+fi
+
+if ! git diff --quiet || ! git diff --cached --quiet; then
+	echo "Working tree is not clean. Commit or stash your changes first."
+	exit 1
+fi
+
+if git rev-parse -q --verify "refs/tags/${VERSION}" >/dev/null; then
+	echo "Tag ${VERSION} already exists."
+	exit 1
+fi
+
+git checkout "${TAGBRANCH}"
+git merge "${RELEASEBRANCH}"
+git push origin "${TAGBRANCH}"
+git tag -a "${VERSION}" -m "${MESSAGE}"
+git push origin "${VERSION}"