weldr/upload: no longer reuse the structs from the target package

For serializeation, make our own private structs. The structs
in the target package are not exactly the same as the ones used by
weldr, so in order to avoid too many compromises, let's just do
an explicity translation.

As a general principle, we aim to only use private types for
serialization and rather translate than reuse for different
purposes.

Signed-off-by: Tom Gundersen <teg@jklm.no>

internal/weldr/compose.go

@@ -1,10 +1,11 @@
 package weldr
 
 import (
+	"sort"
+
 	"github.com/google/uuid"
 	"github.com/osbuild/osbuild-composer/internal/common"
 	"github.com/osbuild/osbuild-composer/internal/compose"
-	"sort"
 )
 
 type ComposeEntry struct {
@@ -17,7 +18,7 @@ type ComposeEntry struct {
 	JobCreated  float64                `json:"job_created"`
 	JobStarted  float64                `json:"job_started,omitempty"`
 	JobFinished float64                `json:"job_finished,omitempty"`
-	Uploads     []UploadResponse       `json:"uploads,omitempty"`
+	Uploads     []uploadResponse       `json:"uploads,omitempty"`
 }
 
 func composeToComposeEntry(id uuid.UUID, compose compose.Compose, includeUploads bool) *ComposeEntry {
@@ -30,7 +31,7 @@ func composeToComposeEntry(id uuid.UUID, compose compose.Compose, includeUploads
 	composeEntry.QueueStatus = compose.ImageBuilds[0].QueueStatus
 
 	if includeUploads {
-		composeEntry.Uploads = TargetsToUploadResponses(compose.ImageBuilds[0].Targets)
+		composeEntry.Uploads = targetsToUploadResponses(compose.ImageBuilds[0].Targets)
 	}
 
 	switch compose.ImageBuilds[0].QueueStatus {