Expose env vars as parameters to the stack

[JohnPreston]

tested with

services:
  proxy:
    image: nginx
    environment:
      ENV_var01: something
      ENV_VAR_01: else
      env_VAR02: hello
      ENVVAR02: world
      PXY_ANumber: 10
    x-environment:
      SetAsParameter:
        - ENV_var01
        - ENV_VAR_01
        - env_VAR02
        - ENVVAR02
        - DOES_NOT_EXIST
        - PXY_ANumber
  backend:
    image: nginx
    environment:
      ENV_var01: 1
      ENV_VAR_01: else
      env_VAR02: hello
      ENVVAR02: world
    x-environment:
      SetAsParameter:
        ENV_var01:
          Type: Number
        ENV_VAR_01:
          Type: String
        env_VAR02:
          Type: CommaDelimitedList
          Description: Something totally useful
        ENVVAR02:
          Type: String
          AllowedPattern: '^[\w]+$'
        DOES_NOT_EXIST:
          Type: WhateverTheWeather

[sonarcloud]

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