fix a compile error #1083 (#1084)

.gitignore

@@ -1,4 +1,3 @@
-vuls
 .vscode
 *.txt
 *.json

cmd/vuls/main.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"context"
+
+	"github.com/future-architect/vuls/config"
+	commands "github.com/future-architect/vuls/subcmds"
+	"github.com/google/subcommands"
+)
+
+func main() {
+	subcommands.Register(subcommands.HelpCommand(), "")
+	subcommands.Register(subcommands.FlagsCommand(), "")
+	subcommands.Register(subcommands.CommandsCommand(), "")
+	subcommands.Register(&commands.DiscoverCmd{}, "discover")
+	subcommands.Register(&commands.TuiCmd{}, "tui")
+	subcommands.Register(&commands.ScanCmd{}, "scan")
+	subcommands.Register(&commands.HistoryCmd{}, "history")
+	subcommands.Register(&commands.ReportCmd{}, "report")
+	subcommands.Register(&commands.ConfigtestCmd{}, "configtest")
+	subcommands.Register(&commands.ServerCmd{}, "server")
+
+	var v = flag.Bool("v", false, "Show version")
+
+	flag.Parse()
+
+	if *v {
+		fmt.Printf("vuls %s %s\n", config.Version, config.Revision)
+		os.Exit(int(subcommands.ExitSuccess))
+	}
+
+	ctx := context.Background()
+	os.Exit(int(subcommands.Execute(ctx)))
+}