Add more alerting test domains and alert if at least 2 domains fail #1344

Job	Run time
build-docker (internet.nl, docker/Dockerfile, app)	57s
build-docker (unbound, docker/Dockerfile, unbound)	48s
build-docker (linttest, docker/Dockerfile, linttest)	1m 1s
build-docker (test-runner, docker/test-runner.Dockerfile)	51s
build-docker (webserver, docker/webserver.Dockerfile)	1m 4s
build-docker (grafana, docker/grafana.Dockerfile)	1m 9s
build-docker (cron, docker/cron.Dockerfile)	1m 3s
docs	1s
integration-test	3m 11s
batch-integration-test	2m 40s
development-environment-test	2m 25s
lint/check	39s
test	2m 27s
	18m 16s

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