chore: not load plugins for auto-generating docs (#5569)

Signed-off-by: knqyf263 <knqyf263@gmail.com>

magefiles/docs.go

@@ -3,6 +3,8 @@
 package main
 
 import (
+	"os"
+
 	"github.com/spf13/cobra/doc"
 
 	"github.com/aquasecurity/trivy/pkg/commands"
@@ -16,6 +18,9 @@ func main() {
 	flag.CacheDirFlag.Default = "/path/to/cache"
 	flag.ModuleDirFlag.Default = "$HOME/.trivy/modules"
 
+	// Set a dummy path not to load plugins
+	os.Setenv("XDG_DATA_HOME", os.TempDir())
+
 	cmd := commands.NewApp()
 	cmd.DisableAutoGenTag = true
 	if err := doc.GenMarkdownTree(cmd, "./docs/docs/references/configuration/cli"); err != nil {