weldr: get repositories from distro

Make distros export repository information and use those in the weldr
API. This means that repos are only specified once and that the API
returns the right packages when we allow different distros.

cmd/osbuild-composer/main.go

@@ -5,6 +5,7 @@ import (
 	"log"
 	"os"
 
+	"github.com/osbuild/osbuild-composer/internal/distro"
 	"github.com/osbuild/osbuild-composer/internal/jobqueue"
 	"github.com/osbuild/osbuild-composer/internal/rpmmd"
 	"github.com/osbuild/osbuild-composer/internal/store"
@@ -32,13 +33,8 @@ func main() {
 	weldrListener := listeners[0]
 	jobListener := listeners[1]
 
-	repo := rpmmd.RepoConfig{
-		Id:       "fedora",
-		Name:     "Fedora 30",
-		Metalink: "https://mirrors.fedoraproject.org/metalink?repo=fedora-30&arch=x86_64",
-	}
-
 	rpm := rpmmd.NewRPMMD()
+	distribution := distro.New("")
 
 	var logger *log.Logger
 	if verbose {
@@ -53,7 +49,7 @@ func main() {
 	store := store.New(&stateFile)
 
 	jobAPI := jobqueue.New(logger, store)
-	weldrAPI := weldr.New(rpm, repo, logger, store)
+	weldrAPI := weldr.New(rpm, distribution, logger, store)
 
 	go jobAPI.Serve(jobListener)
 	weldrAPI.Serve(weldrListener)