kojiapi: make repo gpgkey optional

The kojiapi actually shouldn't require it as we need to build images from
unsigned packages.

Fixes #985

internal/kojiapi/api/api.gen.go

@@ -53,8 +53,8 @@ type Koji struct {
 
 // Repository defines model for Repository.
 type Repository struct {
-	Baseurl string `json:"baseurl"`
-	Gpgkey  string `json:"gpgkey"`
+	Baseurl string  `json:"baseurl"`
+	Gpgkey  *string `json:"gpgkey,omitempty"`
 }
 
 // Status defines model for Status.

internal/kojiapi/api/openapi.yml

@@ -176,7 +176,6 @@ components:
       type: object
       required:
         - baseurl
-        - gpgkey
       properties:
         baseurl:
           type: string

internal/kojiapi/server.go

@@ -112,7 +112,9 @@ func (h *apiHandlers) PostCompose(ctx echo.Context) error {
 		repositories := make([]rpmmd.RepoConfig, len(ir.Repositories))
 		for j, repo := range ir.Repositories {
 			repositories[j].BaseURL = repo.Baseurl
-			repositories[j].GPGKey = repo.Gpgkey
+			if repo.Gpgkey != nil {
+				repositories[j].GPGKey = *repo.Gpgkey
+			}
 		}
 		bp := &blueprint.Blueprint{}
 		err = bp.Initialize()