libgit2: make RemoteCallbacks helper public

Main requirement for this is the image-automation-controller
depending on being able to get a working auth configuration.

Once the package is moved, we should add push logic to it,
so that the controller is able to use that instead.

Signed-off-by: Hidde Beydals <hello@hidde.co>

pkg/git/libgit2/checkout.go

@@ -63,7 +63,7 @@ func (c *CheckoutBranch) Checkout(ctx context.Context, path, url string, opts *g
 	repo, err := git2go.Clone(url, path, &git2go.CloneOptions{
 		FetchOptions: &git2go.FetchOptions{
 			DownloadTags:    git2go.DownloadTagsNone,
-			RemoteCallbacks: remoteCallbacks(opts),
+			RemoteCallbacks: RemoteCallbacks(opts),
 		},
 		CheckoutBranch: c.Branch,
 	})
@@ -92,7 +92,7 @@ func (c *CheckoutTag) Checkout(ctx context.Context, path, url string, opts *git.
 	repo, err := git2go.Clone(url, path, &git2go.CloneOptions{
 		FetchOptions: &git2go.FetchOptions{
 			DownloadTags:    git2go.DownloadTagsAll,
-			RemoteCallbacks: remoteCallbacks(opts),
+			RemoteCallbacks: RemoteCallbacks(opts),
 		},
 	})
 	if err != nil {
@@ -115,7 +115,7 @@ func (c *CheckoutCommit) Checkout(ctx context.Context, path, url string, opts *g
 	repo, err := git2go.Clone(url, path, &git2go.CloneOptions{
 		FetchOptions: &git2go.FetchOptions{
 			DownloadTags:    git2go.DownloadTagsNone,
-			RemoteCallbacks: remoteCallbacks(opts),
+			RemoteCallbacks: RemoteCallbacks(opts),
 		},
 	})
 	if err != nil {
@@ -146,7 +146,7 @@ func (c *CheckoutSemVer) Checkout(ctx context.Context, path, url string, opts *g
 	repo, err := git2go.Clone(url, path, &git2go.CloneOptions{
 		FetchOptions: &git2go.FetchOptions{
 			DownloadTags:    git2go.DownloadTagsAll,
-			RemoteCallbacks: remoteCallbacks(opts),
+			RemoteCallbacks: RemoteCallbacks(opts),
 		},
 	})
 	if err != nil {

pkg/git/libgit2/transport.go

@@ -39,9 +39,9 @@ var (
 	now = time.Now
 )
 
-// remoteCallbacks constructs RemoteCallbacks with credentialsCallback and
+// RemoteCallbacks constructs RemoteCallbacks with credentialsCallback and
 // certificateCallback, and the given options if the given opts is not nil.
-func remoteCallbacks(opts *git.AuthOptions) git2go.RemoteCallbacks {
+func RemoteCallbacks(opts *git.AuthOptions) git2go.RemoteCallbacks {
 	if opts != nil {
 		return git2go.RemoteCallbacks{
 			CredentialsCallback:      credentialsCallback(opts),