Add scripts config section for custom builds, starts, tests, etc.

[MikeBild]

• Support for custom scripts in CLI / .dropstack.json

Example

dropstack deploy --script-add start="./start.sh" --script-add build="./build.sh"

{
  "variables": [],
  "instances": 1,
  "type": "mono",
  "name": "foo",
  "serviceUrl": "foo.cloud.dropstack.run",
  "scripts": {
    "start": "./start.sh",
    "build": "./build.sh",
    "test": "./test.sh",
  }
}

[MikeBild]

{
"variables": "start=./start.sh,build=./scripts/build.sh",
"instances": 1,
"type": "mono",
"name": "foo",
"serviceUrl": "foo.cloud.dropstack.run"
}