Subsequent DynamicStore.Put calls do not set credential store once failure

[shizhMSFT]

In the following code block:

oras-go/registry/remote/credentials/store.go

Lines 136 to 152 in 8d139f0

	// Put saves credentials into the store for the given server address.
	// Put returns ErrPlaintextPutDisabled if native store is not available and
	// [StoreOptions].AllowPlaintextPut is set to false.
	func (ds *DynamicStore) Put(ctx context.Context, serverAddress string, cred auth.Credential) (returnErr error) {
	if err := ds.getStore(serverAddress).Put(ctx, serverAddress, cred); err != nil {
	return err
	}
	// save the detected creds store back to the config file on first put
	ds.setCredsStoreOnce.Do(func() {
	if ds.detectedCredsStore != "" {
	if err := ds.config.SetCredentialsStore(ds.detectedCredsStore); err != nil {
	returnErr = fmt.Errorf("failed to set credsStore: %w", err)
	}
	}
	})
	return returnErr
	}

If ds.setCredsStoreOnce fails on the first call to Put, the subsequent calls to Put will never attempt to set the credential store again but return success.