Add more alerting test domains and alert if at least 2 domains fail #1345

Job	Run time
build-docker (internet.nl, docker/Dockerfile, app)	57s
build-docker (unbound, docker/Dockerfile, unbound)	49s
build-docker (linttest, docker/Dockerfile, linttest)	1m 0s
build-docker (test-runner, docker/test-runner.Dockerfile)	48s
build-docker (webserver, docker/webserver.Dockerfile)	49s
build-docker (grafana, docker/grafana.Dockerfile)	57s
build-docker (cron, docker/cron.Dockerfile)	50s
integration-test	3m 57s
docs	1s
development-environment-test	3m 5s
batch-integration-test	2m 55s
lint/check	39s
test	2m 25s
	19m 12s

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