reporegistry: move to logrus instead of log.Printf()

This commit removes the direct log.Printf() from the repo loading.
With the coming daemonless CLI frontend to image building these
prints are distracting for our users.

Instead logrus (which is already used in the images library) is
used with the appropriate "Infof()" and "Warnf()" methods.

pkg/reporegistry/repository.go

@@ -1,11 +1,12 @@
 package reporegistry
 
 import (
-	"log"
 	"os"
 	"path/filepath"
 	"strings"
 
+	"github.com/sirupsen/logrus"
+
 	"github.com/osbuild/images/pkg/distroidparser"
 	"github.com/osbuild/images/pkg/rpmmd"
 )
@@ -39,7 +40,7 @@ func LoadAllRepositories(confPaths []string) (rpmmd.DistrosRepoConfigs, error) {
 				// without a dot to separate major and minor release versions
 				distro, err := distroidparser.DefaultParser.Standardize(distroIDStr)
 				if err != nil {
-					log.Printf("failed to parse distro ID string, using it as is: %v", err)
+					logrus.Warnf("failed to parse distro ID string, using it as is: %v", err)
 					// NB: Before the introduction of distro ID standardization, the filename
 					//     was used as the distro ID. This is kept for backward compatibility
 					//     if the filename can't be parsed.
@@ -58,7 +59,7 @@ func LoadAllRepositories(confPaths []string) (rpmmd.DistrosRepoConfigs, error) {
 					return nil, err
 				}
 
-				log.Println("Loaded repository configuration file:", configFile)
+				logrus.Infof("Loaded repository configuration file: %s", configFile)
 
 				distrosRepoConfigs[distro] = distroRepos
 			}