feat(packer): support for template directories

[NefixEstrada]

Description

Fixes #1271

With this PR you can use directories for Packer templates

Release Notes (draft)

Added support for Packer template directories

[denis256]

Hello,
Adding tests would ensure the ongoing functionality of these changes. Please consider including them. Thank you! 👍

[NefixEstrada]

I'm not really sure how to add the tests, since this function calls the actual packer binary

[denis256]

Hi,
can be added example for packer and respective tests

References:

https://github.com/gruntwork-io/terratest/blob/master/test/terraform_packer_example_test.go

https://github.com/gruntwork-io/terratest/tree/master/examples/packer-docker-example

[walbertus]

is this still ongoing? we need this because our packer template use multiple files

[NefixEstrada]

We use this in production and works, however I didn't come around to write the tests

[walbertus]

@NefixEstrada do you mind if I take a look and try to create the test?

[NefixEstrada]

@walbertus

Sure, go ahead!

Thanks,
Néfix

[NefixEstrada]

Hello @denis256 , @walbertus has implemented the required tests. Could you take a look again at the MR?

Thank you,
Néfix

[walbertus]

any input @denis256 ?
I'm thinking of adding a mock here to check the binary call but can't find a way to do it.
Do you have test recommendations in mind?