feat #1342: support specify custom python3 venv

hrp/cmd/pytest.go

@@ -1,8 +1,10 @@
 package cmd
 
 import (
+	"github.com/rs/zerolog/log"
 	"github.com/spf13/cobra"
 
+	"github.com/httprunner/httprunner/v4/hrp/internal/builtin"
 	"github.com/httprunner/httprunner/v4/hrp/internal/pytest"
 )
 
@@ -15,6 +17,11 @@ var pytestCmd = &cobra.Command{
 	},
 	DisableFlagParsing: true, // allow to pass any args to pytest
 	RunE: func(cmd *cobra.Command, args []string) error {
+		err := builtin.PrepareVenv(venv)
+		if err != nil {
+			log.Error().Err(err).Msg("prepare python3 venv failed")
+			return err
+		}
 		return pytest.RunPytest(args)
 	},
 }