Use correct log level for `CheckCanonicalDomain` (#162)

- Currently any error generated by requesting the `.domains` file of a repository would be logged under the info log level, which isn't the correct log level when we exclude the not found error.
- Use warn log level if the error isn't the not found error.

Co-authored-by: Gusted <postmaster@gusted.xyz>
Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/162
Reviewed-by: Otto <otto@codeberg.org>

server/upstream/domains.go

@@ -45,7 +45,11 @@ func (o *Options) CheckCanonicalDomain(giteaClient *gitea.Client, actualDomain,
 				}
 			}
 		} else {
-			log.Info().Err(err).Msgf("could not read %s of %s/%s", canonicalDomainConfig, o.TargetOwner, o.TargetRepo)
+			if err != gitea.ErrorNotFound {
+				log.Error().Err(err).Msgf("could not read %s of %s/%s", canonicalDomainConfig, o.TargetOwner, o.TargetRepo)
+			} else {
+				log.Info().Err(err).Msgf("could not read %s of %s/%s", canonicalDomainConfig, o.TargetOwner, o.TargetRepo)
+			}
 		}
 		domains = append(domains, o.TargetOwner+mainDomainSuffix)
 		if domains[len(domains)-1] == actualDomain {