add: push changes to gitea server after merging local changes

This implementation has no configuration yet to authorize accordingly.
WIP for #3 and #4.

cmd/gitw/main.go

@@ -29,6 +29,12 @@ func main() {
 		os.Exit(-1)
 	}
 
+	fmt.Printf("Push changes to %s\n", repository.Full_name)
+	if err = project.Push(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(-1)
+	}
+
 	// NOTE: this can be used to add / modify tasks
 	// var update_tasks []taskwarrior.Task
 	// task := taskwarrior.NewTask(