add notice about x64 issues on arm systems #743

Job	Run time
build-docker (internet.nl, docker/Dockerfile, app)	1m 6s
build-docker (unbound, docker/Dockerfile, unbound)	1m 5s
build-docker (linttest, docker/Dockerfile, linttest)	48s
build-docker (test-runner, docker/test-runner.Dockerfile)	46s
build-docker (webserver, docker/webserver.Dockerfile)	56s
build-docker (rabbitmq, docker/rabbitmq.Dockerfile)	57s
build-docker (grafana, docker/grafana.Dockerfile)	57s
build-docker (prometheus, docker/prometheus.Dockerfile)	49s
build-docker (cron, docker/cron.Dockerfile)	53s
test	2m 2s
docs	1s
integration-test	2m 45s
development-environment-test	2m 19s
lint/check	42s
	16m 6s

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