Bump happy-dom from 14.12.3 to 15.7.4 in /frontend #990

	###############################################################################
	# A Github repo has max 10 GB of cache.
	# https://github.blog/changelog/2021-11-23-github-actions-cache-size-is-now-increased-to-10gb-per-repository/
	#
	# To avoid "cache thrashing" by their cache eviction policy it is recommended
	# to apply a cache cleanup workflow at PR closing to dele cache leftovers of
	# the current branch:
	# https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#force-deleting-cache-entries
	###############################################################################

	name: ocelot.social cache cleanup on pr closing

	on:
	pull_request:
	types:
	- closed

	jobs:
	clean-branch-cache:
	name: Cleanup branch cache
	runs-on: ubuntu-latest
	continue-on-error: true
	steps:
	- name: Checkout code
	uses: actions/checkout@6d193bf28034eafb982f37bd894289fe649468fc # v4.1.7

	- name: Cleanup
	run: \|
	gh extension install actions/gh-actions-cache
	REPO=${{ github.repository }}
	BRANCH="refs/pull/${{ github.event.pull_request.number }}/merge"
	echo "Fetching list of cache key"
	cacheKeysForPR=$(gh actions-cache list -R $REPO -B $BRANCH \| cut -f 1 )
	set +e
	echo "Deleting caches..."
	for cacheKey in $cacheKeysForPR
	do
	gh actions-cache delete $cacheKey -R $REPO -B $BRANCH --confirm
	done
	echo "Done"
	env:
	GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

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