Remove all images not used by containers on a weekly basis to prevent… #1386

Job	Run time
build-docker (internet.nl, docker/Dockerfile, app)	56s
build-docker (internet.nl, docker/Dockerfile, app)	1m 25s
build-docker (unbound, docker/Dockerfile, unbound)	49s
build-docker (unbound, docker/Dockerfile, unbound)	1m 11s
build-docker (linttest, docker/Dockerfile, linttest)	1m 24s
build-docker (linttest, docker/Dockerfile, linttest)	1m 19s
build-docker (test-runner, docker/test-runner.Dockerfile)	55s
build-docker (test-runner, docker/test-runner.Dockerfile)	1m 5s
build-docker (webserver, docker/webserver.Dockerfile)	51s
build-docker (webserver, docker/webserver.Dockerfile)	1m 12s
build-docker (grafana, docker/grafana.Dockerfile)	55s
build-docker (grafana, docker/grafana.Dockerfile)	1m 4s
build-docker (cron, docker/cron.Dockerfile)	1m 7s
build-docker (cron, docker/cron.Dockerfile)	1m 19s
batch-integration-test	2m 40s
batch-integration-test	2m 35s
development-environment-test	5m 26s
development-environment-test	2m 32s
docs	1s
docs	1s
integration-test	3m 22s
integration-test	3m 3s
lint/check	52s
lint/check	50s
test	2m 33s
test	2m 34s
	42m 1s

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