replace parsedotenv.env map with []string

[komuw]

A requisite for this is that we port over the test suite from[3]

replace parsedotenv.env replace env with a []string since ComposeService.Environment is a []string[1]

This will help us not incur this loop[2]

ref:

1. meli/parsedotenv.go

   Lines 25 to 26 in 7fab55b

   	// env holds key/value pair of valid environment variable
   	// TODO: replace env with a []string since ComposeService.Environment is a []string

2. meli/container.go

   Lines 186 to 195 in 7fab55b

   	// TODO: replace env in parseDotEnv.go with a []string since ComposeService.Environment is a []string
   	// that way we wont have to incur this for loop
   	containerEnv := []string{}
   	for k, v := range envMap {
   	envMap[k] = v
   	x := fmt.Sprintf("%s=%s", k, v)
   	containerEnv = append(containerEnv, x)
   	}
   	containerEnv = append(containerEnv, dc.ComposeService.Environment...)
   	fmt.Printf("\n\n containerEnv 2:%v \n", containerEnv)

3. https://github.com/subosito/gotenv/blob/master/gotenv_test.go