ci: add npm script and workflow for code coverage #3

	name: Coverage

	on: [push, pull_request]

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: pull image
	run: docker pull existdb/existdb:release
	- name: create eXist-db Container
	run: \|
	docker create --rm --name exist \
	--publish 8080:8080 --publish 8443:8443 \
	existdb/existdb:release
	- name: Start eXist-db Container
	run: docker start exist
	- name: Use Node.js 20
	uses: actions/setup-node@v4
	with:
	node-version: 20
	- run: npm ci --no-optional
	- run: npm link
	- name: Wait for container to be healthy
	run: timeout 60s sh -c 'until docker ps \| grep exist \| grep -q healthy; do echo "Not ready yet."; sleep 2; done; echo "$(docker ps \| grep exist)"'
	- name: Run tests with coverage
	run: npm run coverage \| npx tap-dot
	- name: Report coverage
	run: npx c8 report

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