osbuild2: new stage authconfig

This stage was introduced in osbuild 41. Add support into
osbuild-composer.

internal/osbuild2/authconfig_stage.go

@@ -0,0 +1,13 @@
+package osbuild2
+
+type AuthconfigStageOptions struct {
+}
+
+func (AuthconfigStageOptions) isStageOptions() {}
+
+func NewAuthconfigStage(options *AuthconfigStageOptions) *Stage {
+	return &Stage{
+		Type:    "org.osbuild.authconfig",
+		Options: options,
+	}
+}

internal/osbuild2/authconfig_stage_test.go

@@ -0,0 +1,16 @@
+package osbuild2
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewAuthconfigStage(t *testing.T) {
+	expectedStage := &Stage{
+		Type:    "org.osbuild.authconfig",
+		Options: &AuthconfigStageOptions{},
+	}
+	actualStage := NewAuthconfigStage(&AuthconfigStageOptions{})
+	assert.Equal(t, expectedStage, actualStage)
+}

internal/osbuild2/stage.go

@@ -148,6 +148,8 @@ func (stage *Stage) UnmarshalJSON(data []byte) error {
 		inputs = new(FilesInputs)
 	case "org.osbuild.sshd.config":
 		options = new(SshdConfigStageOptions)
+	case "org.osbuild.authconfig":
+		options = new(AuthconfigStageOptions)
 	default:
 		return fmt.Errorf("unexpected stage type: %s", rawStage.Type)
 	}

internal/osbuild2/stage_test.go

@@ -647,6 +647,16 @@ func TestStage_UnmarshalJSON(t *testing.T) {
 				data: []byte(`{"type":"org.osbuild.sshd.config","options":{"config":{}}}`),
 			},
 		},
+		{
+			name: "authconfig",
+			fields: fields{
+				Type:    "org.osbuild.authconfig",
+				Options: &AuthconfigStageOptions{},
+			},
+			args: args{
+				data: []byte(`{"type":"org.osbuild.authconfig","options":{}}`),
+			},
+		},
 	}
 	for idx, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {