kojiapi: include image type exports in Koji job args

Koji image request handling now reads the exports defined by each image
type. All APIs now support reading the exports defined by each image
type. The worker still falls back to "assembler" in case the call comes
from an older version of composer.

internal/kojiapi/server.go

@@ -85,6 +85,7 @@ func (h *apiHandlers) PostCompose(ctx echo.Context) error {
 		manifest distro.Manifest
 		arch     string
 		filename string
+		exports  []string
 	}
 
 	imageRequests := make([]imageRequest, len(request.ImageRequests))
@@ -138,6 +139,7 @@ func (h *apiHandlers) PostCompose(ctx echo.Context) error {
 		imageRequests[i].manifest = manifest
 		imageRequests[i].arch = arch.Name()
 		imageRequests[i].filename = imageType.Filename()
+		imageRequests[i].exports = imageType.Exports()
 
 		kojiFilenames[i] = fmt.Sprintf(
 			"%s-%s-%s.%s%s",
@@ -165,6 +167,7 @@ func (h *apiHandlers) PostCompose(ctx echo.Context) error {
 		id, err := h.server.workers.EnqueueOSBuildKoji(ir.arch, &worker.OSBuildKojiJob{
 			Manifest:      ir.manifest,
 			ImageName:     ir.filename,
+			Exports:       ir.exports,
 			KojiServer:    request.Koji.Server,
 			KojiDirectory: kojiDirectory,
 			KojiFilename:  kojiFilenames[i],