Add Actions workflow to automatically create release tags (#1439) #1

	# When a release commit created by create-release.yml is landed, create the
	# corresponding tag.
	name: Create release tag

	on:
	push:
	paths: [ emscripten-releases-tags.json, .github/workflows/tag-release.yml ]
	workflow_dispatch:

	jobs:
	tag-release:
	# Only activate for commits created by the create-release.yml workflow.
	# The assumption is that when manual changes happen, we want to handle
	# tagging manually too.
	if: github.event.head_commit.author.username == 'github-actions[bot]'
	runs-on: ubuntu-latest
	steps:
	- name: Match message and create tag
	uses: actions/github-script@v7
	with:
	script: \|
	const message = `${{ github.event.head_commit.message }}`
	const regex = /Release ([0-9]+.[0-9]+.[0-9]+)/
	const match = message.match(regex)
	if (match) {
	const release = match[1]
	console.log(`Matched release ${release}`)
	await github.rest.git.createRef({
	owner: context.repo.owner,
	repo: context.repo.repo,
	ref: `refs/tags/${release}`,
	sha: context.sha
	})
	} else {
	console.log(`Commit message: ${message} did not match pattern`)
	}

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