Add more alerting test domains and alert if at least 2 domains fail #1339

Job	Run time
build-docker (internet.nl, docker/Dockerfile, app)	1m 15s
build-docker (unbound, docker/Dockerfile, unbound)	1m 5s
build-docker (linttest, docker/Dockerfile, linttest)	1m 0s
build-docker (test-runner, docker/test-runner.Dockerfile)	58s
build-docker (webserver, docker/webserver.Dockerfile)	1m 3s
build-docker (grafana, docker/grafana.Dockerfile)	1m 12s
build-docker (cron, docker/cron.Dockerfile)	1m 6s
test	2m 25s
docs	1s
development-environment-test	2m 34s
batch-integration-test	2m 44s
integration-test	3m 21s
lint/check	43s
	19m 27s

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