docs: set v6 release date (#168)

radar/2023-02-23/harbor.md

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+---
+title:      "Harbor"
+ring:       trial
+quadrant:   platforms-and-aoe-services
+tags:       [devops]
+---
+
+[Harbor](https://goharbor.io) is a CNCF-graduated open-source container registry. We use it to host custom-built
+container images from our projects. Key benefits for us are:
+
+- Harbor automatically scans all container images with [Trivy](https://trivy.dev)
+- fine-grained access control allows Harbor to be used in a multi-team environment
+- its extensive API allows easy adaption to custom needs, like retention policies
+- support for image signing with [Cosign](https://github.com/SigStore/cosign)