osbuild: add support for resolv-conf stage

internal/distro/rhel90/distro.go

@@ -283,6 +283,8 @@ func (t *imageType) pipeline(c *blueprint.Customizations, options distro.ImageOp
 	p.AddStage(osbuild.NewRPMStage(t.rpmStageOptions(*t.arch, repos, packageSpecs)))
 	p.AddStage(osbuild.NewFixBLSStage())
 
+	p.AddStage(osbuild.NewResolvConfStage(t.resolvConfOptions()))
+
 	if pt != nil {
 		p.AddStage(osbuild.NewFSTabStage(pt.FSTabStageOptions()))
 	}
@@ -460,6 +462,10 @@ func (t *imageType) userStageOptions(users []blueprint.UserCustomization) (*osbu
 	return &options, nil
 }
 
+func (t *imageType) resolvConfOptions() *osbuild.ResolvConfStageOptions {
+	return &osbuild.ResolvConfStageOptions{}
+}
+
 func (t *imageType) groupStageOptions(groups []blueprint.GroupCustomization) *osbuild.GroupsStageOptions {
 	options := osbuild.GroupsStageOptions{
 		Groups: map[string]osbuild.GroupsStageOptionsGroup{},

internal/osbuild1/resolv_conf_stage.go

@@ -0,0 +1,15 @@
+package osbuild1
+
+type ResolvConfStageOptions struct {
+	Nameserver []string `json:"nameserver,omitempty"`
+	Search     []string `json:"search,omitempty"`
+}
+
+func (ResolvConfStageOptions) isStageOptions() {}
+
+func NewResolvConfStage(options *ResolvConfStageOptions) *Stage {
+	return &Stage{
+		Name:    "org.osbuild.resolv-conf",
+		Options: options,
+	}
+}

internal/osbuild1/resolv_conf_stage_test.go

@@ -0,0 +1,16 @@
+package osbuild1
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewResolvConfStageStage(t *testing.T) {
+	expectedStage := &Stage{
+		Name:    "org.osbuild.resolv-conf",
+		Options: &ResolvConfStageOptions{},
+	}
+	actualStage := NewResolvConfStage(&ResolvConfStageOptions{})
+	assert.Equal(t, expectedStage, actualStage)
+}