chore(main): release 1.21.0

[hcloud-bot]

🤖 I have created a release beep boop

1.21.0 (2024-11-25)

Features

• add support & tests for Kubernetes 1.31 (#747) (c1e903c)
• drop tests for kubernetes v1.27 (#748) (0485215)
• emit event when robot server name and node name mismatch (#773) (7960ddc)
• helm: allow setting extra pod volumes via chart values (#744) (ad43445), closes #743
• instance: add label to distinguish servers from Cloud and Robot (#764) (e6c0356)
• load-balancer: ignore nodes that don't use known provider IDs (#780) (6544740)
• load-balancer: Set IPMode to "Proxy" if load balancer is configured to use proxy protocol (#727) (#783) (c9cfdaf)
• routes: emit warning if cluster cidr is misconfigured (#793) (81cc8b2)
• service: Specify private ip for loadbalancer (#724) (4801f0e)

Bug Fixes

• invalid characters in label instance-type of robot servers (#770) (dfffde7)
• no events are emitted as broadcaster has no sink configured (#774) (635c727)
• populate ingress private ip when disable-private-ingress is false (#715) (8d29153)
• wrong version logged on startup (#729) (6b8cbf4)

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[jooola]

8d29153 includes some upgrade notes

[jooola]

#783 (comment)

We might need to drop k8s 1.28 before releasing

[apricote]

Replaced by #806.