[WIP] workflows: add workflow to create snapshot tag #1

	name: Snapshot tag

	# SPDX-FileCopyrightText: 2023 Nextcloud GmbH and Nextcloud contributors
	# SPDX-FileCopyrightText: 2024 STRATO AG
	# SPDX-License-Identifier: AGPL-3.0-or-later

	# Create snapshot tags for pushes to the main development branch
	# This in turn triggers a release build.

	on:
	push:
	branches:
	# Enable once approved
	# - ionos-dev
	- tl/workflow-build-snapshots-with-releases

	jobs:
	snapshot-tag:
	runs-on: ubuntu-latest

	permissions:
	contents: write

	name: snapshot-tag
	steps:
	- name: Create tag
	uses: actions/github-script@v7
	with:
	# https://octokit.github.io/rest.js/v21/#git-create-tag
	script: \|
	const { DIST_VERSION } = process.env;
	const dateStr = new Date()
	.toISOString()
	.replace(/^(\d+)-(\d+)-(\d+)T(\d+):(\d+):(\d+).*$/, "$1$2$3-$4$5$6");

	github.rest.git.createRef({
	owner: context.repo.owner,
	repo: context.repo.repo,
	message: 'Snapshot',
	ref: `refs/tags/snap-rel-${dateStr}`,
	sha: context.sha
	});

Provide feedback