Enable DCO for all of k8gb (CNCF requirement)

[caniszczyk]

https://github.com/organizations/k8gb-io/settings/installations/17617274

[ytsarev]

@somaritane @caniszczyk so looks like it's done and we can close this one?

[somaritane]

@ytsarev , yep, I think DCO check at #524 proves it

[ytsarev]

@somaritane well, #524 does not fully prove it as DCO was already enabled specifically for k8gb repo. But I think we are good here anyway