rpmmd/repository: repoconfig pointers

Convert some of the fields in the `RepoConfig` struct
to pointers. Since `RepoConfig` will be used to convert
custom repositories to an array of `osbuild.YumRepository`,
we need to ensure that fields that are not set explicitly
are not saved to the `/etc/yum.repos.d` repository files.

cmd/gen-manifests/main.go

@@ -17,6 +17,7 @@ import (
 	"strings"
 
 	"github.com/osbuild/osbuild-composer/internal/blueprint"
+	"github.com/osbuild/osbuild-composer/internal/common"
 	"github.com/osbuild/osbuild-composer/internal/container"
 	"github.com/osbuild/osbuild-composer/internal/distro"
 	"github.com/osbuild/osbuild-composer/internal/distroregistry"
@@ -203,8 +204,8 @@ func convertRepo(r repository) rpmmd.RepoConfig {
 		Metalink:       r.Metalink,
 		MirrorList:     r.MirrorList,
 		GPGKeys:        keys,
-		CheckGPG:       r.CheckGPG,
-		CheckRepoGPG:   false,
+		CheckGPG:       &r.CheckGPG,
+		CheckRepoGPG:   common.ToPtr(false),
 		IgnoreSSL:      false,
 		MetadataExpire: r.MetadataExpire,
 		RHSM:           r.RHSM,

cmd/osbuild-pipeline/main.go

@@ -8,6 +8,7 @@ import (
 	"os"
 	"path"
 
+	"github.com/osbuild/osbuild-composer/internal/common"
 	"github.com/osbuild/osbuild-composer/internal/container"
 	"github.com/osbuild/osbuild-composer/internal/distro"
 	"github.com/osbuild/osbuild-composer/internal/distroregistry"
@@ -149,14 +150,16 @@ func main() {
 			keys = []string{repo.GPGKey}
 		}
 		repos[i] = rpmmd.RepoConfig{
-			Name:        repoName,
-			BaseURLs:    urls,
-			Metalink:    repo.Metalink,
-			MirrorList:  repo.MirrorList,
-			GPGKeys:     keys,
-			CheckGPG:    repo.CheckGPG,
-			PackageSets: repo.PackageSets,
-			RHSM:        repo.RHSM,
+			Name:         repoName,
+			BaseURLs:     urls,
+			Metalink:     repo.Metalink,
+			MirrorList:   repo.MirrorList,
+			GPGKeys:      keys,
+			CheckGPG:     &repo.CheckGPG,
+			CheckRepoGPG: common.ToPtr(false),
+			IgnoreSSL:    false,
+			PackageSets:  repo.PackageSets,
+			RHSM:         repo.RHSM,
 		}
 	}