diff --git a/internal/app/cmd/exec.go b/internal/app/cmd/exec.go
index 9a28170..335f658 100644
--- a/internal/app/cmd/exec.go
+++ b/internal/app/cmd/exec.go
@@ -484,7 +484,7 @@ func loadExecCmd(ctx context.Context) *cobra.Command {
 	execCmd.PersistentFlags().BoolVarP(&execArg.noSkipCheckout, "no-skip-checkout", "", false, "Do not skip actions/checkout")
 	execCmd.PersistentFlags().BoolVarP(&execArg.debug, "debug", "d", false, "enable debug log")
 	execCmd.PersistentFlags().BoolVarP(&execArg.dryrun, "dryrun", "n", false, "dryrun mode")
-	execCmd.PersistentFlags().StringVarP(&execArg.image, "image", "i", "node:16-bullseye", "docker image to use")
+	execCmd.PersistentFlags().StringVarP(&execArg.image, "image", "i", "node:16-bullseye", "Docker image to use. Use \"-self-hosted\" to run directly on the host.")
 	execCmd.PersistentFlags().StringVarP(&execArg.network, "network", "", "", "Specify the network to which the container will connect")
 	execCmd.PersistentFlags().StringVarP(&execArg.githubInstance, "gitea-instance", "", "", "Gitea instance to use.")
 
diff --git a/internal/pkg/report/reporter.go b/internal/pkg/report/reporter.go
index 7e9a2d5..0a3ed79 100644
--- a/internal/pkg/report/reporter.go
+++ b/internal/pkg/report/reporter.go
@@ -418,7 +418,7 @@ func (r *Reporter) parseLogRow(entry *log.Entry) *runnerv1.LogRow {
 
 	return &runnerv1.LogRow{
 		Time:    timestamppb.New(entry.Time),
-		Content: content,
+		Content: strings.ToValidUTF8(content, "?"),
 	}
 }