[image-builder] Fix broken credential split

Author: Prince Rachit Sinha

components/image-builder-bob/pkg/proxy/auth.go

@@ -61,6 +61,7 @@ func (a MapAuthorizer) AddIfNotExists(other MapAuthorizer) MapAuthorizer {
 	}
 	for k, v := range other {
 		if _, ok := a[k]; ok {
+			log.Infof("Skip adding key: %s to MapAuthorizer as it already exists", k)
 			continue
 		}
 		res[k] = v

components/image-builder-mk3/pkg/auth/auth.go

@@ -208,9 +208,9 @@ func (a AllowedAuthFor) additionalAuth(domain string) *Authentication {
 	dec, err := base64.StdEncoding.DecodeString(ath)
 	if err == nil {
 		segs := strings.Split(string(dec), ":")
-		if len(segs) == 2 {
+		if len(segs) > 1 {
 			res.Username = segs[0]
-			res.Password = segs[1]
+			res.Password = strings.Join(segs[1:], ":")
 		}
 	}
 	return res