feat: use go:embed to embed templates (#1756)

tools/goctl/api/gogen/genlogic.go

@@ -1,6 +1,7 @@
 package gogen
 
 import (
+	_ "embed"
 	"fmt"
 	"path"
 	"strconv"
@@ -14,32 +15,8 @@ import (
 	"github.com/zeromicro/go-zero/tools/goctl/vars"
 )
 
-const logicTemplate = `package {{.pkgName}}
-
-import (
-	{{.imports}}
-)
-
-type {{.logic}} struct {
-	logx.Logger
-	ctx    context.Context
-	svcCtx *svc.ServiceContext
-}
-
-func New{{.logic}}(ctx context.Context, svcCtx *svc.ServiceContext) *{{.logic}} {
-	return &{{.logic}}{
-		Logger: logx.WithContext(ctx),
-		ctx:    ctx,
-		svcCtx: svcCtx,
-	}
-}
-
-func (l *{{.logic}}) {{.function}}({{.request}}) {{.responseType}} {
-	// todo: add your logic here and delete this line
-
-	{{.returnString}}
-}
-`
+//go:embed logic.tpl
+var logicTemplate string
 
 func genLogic(dir, rootPkg string, cfg *config.Config, api *spec.ApiSpec) error {
 	for _, g := range api.Service.Groups {