api: Deprecate field gitImplementation

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

Author: Paulo Gomes

api/v1beta2/gitrepository_types.go

@@ -97,6 +97,8 @@ type GitRepositorySpec struct {
 
 	// GitImplementation specifies which Git client library implementation to
 	// use. Defaults to 'go-git', valid values are ('go-git', 'libgit2').
+	// Deprecated: gitImplementation is deprecated now that 'go-git' is the
+	// only supported implementation.
 	// +kubebuilder:validation:Enum=go-git;libgit2
 	// +kubebuilder:default:=go-git
 	// +optional

config/crd/bases/source.toolkit.fluxcd.io_gitrepositories.yaml

@@ -411,9 +411,10 @@ spec:
                 type: object
               gitImplementation:
                 default: go-git
-                description: GitImplementation specifies which Git client library
-                  implementation to use. Defaults to 'go-git', valid values are ('go-git',
-                  'libgit2').
+                description: 'GitImplementation specifies which Git client library
+                  implementation to use. Defaults to ''go-git'', valid values are
+                  (''go-git'', ''libgit2''). Deprecated: gitImplementation is deprecated
+                  now that ''go-git'' is the only supported implementation.'
                 enum:
                 - go-git
                 - libgit2