api: Deprecate field gitImplementation

Signed-off-by: Paulo Gomes <paulo.gomes@weave.works>

Author: Paulo Gomes

api/v1beta2/gitrepository_types.go

@@ -99,6 +99,7 @@ type GitRepositorySpec struct {
 	// use. Defaults to 'go-git', valid values are ('go-git', 'libgit2').
 	// +kubebuilder:validation:Enum=go-git;libgit2
 	// +kubebuilder:default:=go-git
+	// +kubebuilder:deprecatedversion:warning="gitImplementation is deprecated"
 	// +optional
 	GitImplementation string `json:"gitImplementation,omitempty"`