feat(theme): add CSS and json for v4 #1340

	name: Check if SemVer label is set

	on:
	pull_request:
	# cf: https://github.com/yogevbd/enforce-label-action#enforce-pr-labels
	types: [labeled, unlabeled, opened, edited, synchronize]

	env:
	# see: https://github.com/pixiv/charcoal/issues/labels
	SEMVER_LABELS: '["major", "minor", "patch", "beta"]'

	jobs:
	enforce-semver:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/github-script@v6
	with:
	script: \|
	const { issue, repo } = context

	const { data: pull } = await github.rest.issues.get({
	issue_number: issue.number,
	owner: repo.owner,
	repo: repo.repo,
	})

	const labels = pull.labels.map(({ name }) => name)
	const SEMVER_LABELS = JSON.parse(process.env.SEMVER_LABELS)

	const result = new Set()
	for (const label of labels) {
	for (const semver of SEMVER_LABELS) {
	if (label !== semver) {
	continue
	}

	result.add(semver)
	}
	}

	switch (result.size) {
	case 1: {
	const [next] = result.values()
	console.log(`Merging this PR will be a ${next} release`)
	break
	}

	case 0: {
	throw new Error(`One of semver labels (${SEMVER_LABELS}) must be set`)
	}

	default: {
	throw new Error(`Do not set multiple semver labels: ${labels}`)
	}
	}

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