feat: add `cone` option to `content.git` / fix: reduce size of CRDs (… #182

Job	Run time
release_charts	25s
refreshing_gh_pages	2s
notify_slack_if_helm_chart_release_fails	0s
checking_that_ghpages_updated	27s
notify_slack_if_release_succeeds	7s
notify_slack_if_gh_pages_update_failed	0s
Deploy	8s
Pass Testkube OSS chart version to cloud-charts repo	12s
update_release_notes	7s
notify_slack_if_deploy_dev_failed	7s
test suite for DEV GKE.	0s
notify_slack_if_deploy_dev_succeeds	0s
notify_slack_if_test_suite_failed	0s
notify_slack_if_test_suite_dev_succeeds	0s
	1m 35s

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