adding constant for annotation (#1424)
adding constant for annotation (#1424)

* :lipstick: adding constant for label

Signed-off-by: Matthias Wessendorf <mwessend@redhat.com>

* Update apis/duck/register.go

Co-authored-by: Antoine Cotten <aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d@acotten.com>

* Update apis/duck/register.go

Co-authored-by: Antoine Cotten <aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d@acotten.com>

Co-authored-by: Antoine Cotten <aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d@acotten.com>
knative/pkg,knative/pkg