Bugfix/trailing path separator (#1683)

* Test_EnvReplacement: env of path ends in a slash

* Fix trailing path separator

pkg/util/command_util_test.go

@@ -53,6 +53,14 @@ var testEnvReplacement = []struct {
 		isFilepath:   true,
 		expectedPath: "/simple/path/",
 	},
+	{
+		path: "$simple",
+		envs: []string{
+			"simple=/path/",
+		},
+		isFilepath:   true,
+		expectedPath: "/path/",
+	},
 	{
 		path: "${a}/b",
 		envs: []string{