fill ImageConfig on init

[chaya2z]

function.json created by lambda init is missing ImageConfig field. This patch fills it.
I referred to documentation of AWS Lambda GetFunction Response Syntax.

I test this patch can deploy successfully in my development environment.
ImageConfig field in function.json is like this.

{
...
  "ImageConfig": {
    "Command": [
      "cmd"
    ],
    "EntryPoint": [
      "/app"
    ],
    "WorkingDirectory": "/var/task"
  },
...
}

When WorkingDirectory is not configured, GetFunction returns an empty string.

{
...
   "ImageConfig": {
     "Command": [
       "cmd"
     ],
     "EntryPoint": [
       "/app"
     ],
     "WorkingDirectory": ""
   },
...
}

Even in that case, lambroll deploy can deploy Lambda functions without problems.

---

Ref PR: #101

Thank you!

[chaya2z]

Sorry, I fixed test error.

[fujiwara]

@chaya2z Thank you! Great!

I found a small problem in this PR.

If I want to reset the ImageConfig already set, I'll remove the ImageConfig element in a function.json simply.

But lambroll cannot reset the ImageConfig because ImageConfig of UpdateFunctionConfiguration API becomes nil.

I'll fix the problem.

[fujiwara]

@chaya2z v0.14.3 released! https://github.com/fujiwara/lambroll/releases/tag/v0.14.3

[chaya2z]

@fujiwara Thank you for fixing the problem!