added tf workspace in command environment variable

cmd/app.go

	"io"
	"os"
	"os/exec"
	"path"
	"strings"
)
		"CODE_TF_ADD":      "add",
		"CODE_TF_CHECK":    "branches .",
		"CODE_TF_INCOMING": "history -r -stopafter:1 -version:W~T .",
		"CODE_TF_INCOMING": fmt.Sprintf("history -r -stopafter:1 -version:W%s~T .", path.Base(GetWorkingDirectory())),
		"CODE_TF_MERGE":    "merge",
		"CODE_TF_MV":       "rename",
		"CODE_TF_PULL":     "get -preview",
	}
	// Execute the command and swallow any output
	//var out bytes.Buffer
	actions := strings.Split(env, " ")
	cmd := exec.Command(vcs, actions...)
	//cmd.Stdout = &out
	return cmd.Run()
}