ostree: define type for handling ostree remote config

A new struct in ostree can be used to define configuration options for
the ostree remote of an image.  So far remotes were always set up with
the remote URL used to pull the commit.  Now we support setting a
different remote with extra configuration options.

This is used by the fedora-iot-raw-image to set up the remote
configuration of the final image, separately from the source of the
commit.

Test manifests updated.

internal/manifest/commit_deployment.go

@@ -6,6 +6,7 @@ import (
 	"github.com/osbuild/osbuild-composer/internal/common"
 	"github.com/osbuild/osbuild-composer/internal/disk"
 	"github.com/osbuild/osbuild-composer/internal/osbuild"
+	"github.com/osbuild/osbuild-composer/internal/ostree"
 	"github.com/osbuild/osbuild-composer/internal/platform"
 )
 
@@ -14,6 +15,8 @@ import (
 type OSTreeDeployment struct {
 	Base
 
+	Remote ostree.Remote
+
 	OSVersion string
 
 	osTreeCommit string
@@ -21,7 +24,6 @@ type OSTreeDeployment struct {
 	osTreeRef    string
 
 	osName string
-	remote string
 
 	KernelOptionsAppend []string
 	Keyboard            string
@@ -40,7 +42,6 @@ func NewOSTreeDeployment(m *Manifest,
 	commit string,
 	url string,
 	osName string,
-	remote string,
 	platform platform.Platform) *OSTreeDeployment {
 
 	p := &OSTreeDeployment{
@@ -49,7 +50,6 @@ func NewOSTreeDeployment(m *Manifest,
 		osTreeURL:    url,
 		osTreeRef:    ref,
 		osName:       osName,
-		remote:       remote,
 		platform:     platform,
 	}
 	buildPipeline.addDependent(p)
@@ -80,7 +80,7 @@ func (p *OSTreeDeployment) serialize() osbuild.Pipeline {
 
 	pipeline.AddStage(osbuild.OSTreeInitFsStage())
 	pipeline.AddStage(osbuild.NewOSTreePullStage(
-		&osbuild.OSTreePullStageOptions{Repo: repoPath, Remote: p.remote},
+		&osbuild.OSTreePullStageOptions{Repo: repoPath, Remote: p.Remote.Name},
 		osbuild.NewOstreePullStageInputs("org.osbuild.source", p.osTreeCommit, p.osTreeRef),
 	))
 	pipeline.AddStage(osbuild.NewOSTreeOsInitStage(
@@ -114,7 +114,7 @@ func (p *OSTreeDeployment) serialize() osbuild.Pipeline {
 		&osbuild.OSTreeDeployStageOptions{
 			OsName: p.osName,
 			Ref:    p.osTreeRef,
-			Remote: p.remote,
+			Remote: p.Remote.Name,
 			Mounts: []string{"/boot", "/boot/efi"},
 			Rootfs: osbuild.Rootfs{
 				Label: "root",
@@ -123,19 +123,24 @@ func (p *OSTreeDeployment) serialize() osbuild.Pipeline {
 		},
 	))
 
-	if p.osTreeURL != "" { // TODO: this should never be empty; fail early instead
-		pipeline.AddStage(osbuild.NewOSTreeRemotesStage(
-			&osbuild.OSTreeRemotesStageOptions{
-				Repo: "/ostree/repo",
-				Remotes: []osbuild.OSTreeRemote{
-					{
-						Name: p.remote,
-						URL:  p.osTreeURL,
-					},
+	remoteURL := p.Remote.URL
+	if remoteURL == "" {
+		// if the remote URL for the image is not specified, use the source commit URL
+		remoteURL = p.osTreeURL
+	}
+	pipeline.AddStage(osbuild.NewOSTreeRemotesStage(
+		&osbuild.OSTreeRemotesStageOptions{
+			Repo: "/ostree/repo",
+			Remotes: []osbuild.OSTreeRemote{
+				{
+					Name:        p.Remote.Name,
+					URL:         remoteURL,
+					ContentURL:  p.Remote.ContentURL,
+					GPGKeyPaths: p.Remote.GPGKeyPaths,
 				},
 			},
-		))
-	}
+		},
+	))
 
 	pipeline.AddStage(osbuild.NewOSTreeFillvarStage(
 		&osbuild.OSTreeFillvarStageOptions{