improve CI/CD release process with GitHub Actions and GoReleaser

• Integrate with GoReleaser, sign/verify binaries&container images GitHub Actions OIDC Keyless with cosign
• create GitHub Action workflows for releasing
• Mage?
• Multi-arch support?
• provide the necessary information in version command (version, date, etc), use ldflags?

we are volunteers, please free to assign this to us ‍♂️

cc: @rakyll @dentrax