Setup github actions for building & releasing

[andsens]

I added some Github actions so that you can release by pushing a tag. main is built automatically as well.
Everything is linted as well. I had to bump the golanci version to get the lint action working.

I don't think it's possible (I tried!) to do matrix builds with goreleaser. So the images are now built by through a normal docker-buildx action, though the binary itself is still managed by gorelease. By running the compilations on the proper architectures the ARM build should run considerably faster, and actually works. When using qemu to do image builds I have in the past seen 20+ min. runtimes, timeouts, and all kinds of other failures.

[project0]

Thanks, i appreciate the PR.
Actually i had problems to get the webhook working at all (thus, there is no release yet), i had tremendous issues getting consistent sync to dns due some issues with the labels.
Did you tried it already? Maybe recent version of external-dns fixed something that make it suddenly work correctly.

[andsens]

Hm, well something is definitely off. It keeps syncing the same registry TXT record over and over again. Is that the issue you're talking about? Otherwise post a repro as a DNSEndpoint CRD and I can quickly test it. Like so:

apiVersion: externaldns.k8s.io/v1alpha1
kind: DNSEndpoint
metadata:
  name: examplednsrecord
spec:
  endpoints:
  - dnsName: test.example.com
    recordTTL: 180
    recordType: A
    targets:
    - 127.0.0.1