fix(git): optimize listFiles() BE-11184 (#12160)

api/git/git.go

@@ -6,6 +6,8 @@ import (
 	"path/filepath"
 	"strings"
 
+	gittypes "github.com/portainer/portainer/api/git/types"
+
 	"github.com/go-git/go-git/v5"
 	"github.com/go-git/go-git/v5/config"
 	"github.com/go-git/go-git/v5/plumbing"
@@ -14,7 +16,6 @@ import (
 	githttp "github.com/go-git/go-git/v5/plumbing/transport/http"
 	"github.com/go-git/go-git/v5/storage/memory"
 	"github.com/pkg/errors"
-	gittypes "github.com/portainer/portainer/api/git/types"
 )
 
 type gitClient struct {
@@ -143,6 +144,7 @@ func (c *gitClient) listFiles(ctx context.Context, opt fetchOption) ([]string, e
 		ReferenceName:   plumbing.ReferenceName(opt.referenceName),
 		Auth:            getAuth(opt.username, opt.password),
 		InsecureSkipTLS: opt.tlsSkipVerify,
+		Tags:            git.NoTags,
 	}
 
 	repo, err := git.Clone(memory.NewStorage(), nil, cloneOption)
@@ -166,7 +168,10 @@ func (c *gitClient) listFiles(ctx context.Context, opt fetchOption) ([]string, e
 	}
 
 	var allPaths []string
+
 	w := object.NewTreeWalker(tree, true, nil)
+	defer w.Close()
+
 	for {
 		name, entry, err := w.Next()
 		if err != nil {