agent/api/container/container.go
func (c *Container) MergeEnvironmentVariables(envVars map[string]string) {
	c.lock.Lock()
	defer c.lock.Unlock()

	// don't assume that the environment variable map has been initialized by others
	if c.Environment == nil {
		c.Environment = make(map[string]string)
	}
	for k, v := range envVars {
		c.Environment[k] = v
	}
}
func (c *Container) MergeEnvironmentVariables(envVars map[string]string) {
	c.lock.Lock()
	defer c.lock.Unlock()

	// don't assume that the environment variable map has been initialized by others
	if c.Environment == nil {
		c.Environment = make(map[string]string)
	}
	for k, v := range envVars {
		c.Environment[k] = v
	}
}
// MergeEnvironmentVariables appends additional envVarName:envVarValue pairs to
// the the container's enviornment values structure