Packer: allow templates to be defined using yaml

[kidbrax]

Please allow templates to be defined in YAML. It is easier to read and, more importantly, allows comments.

It is a common use case, even Amazon now allows CloudFormation to be defined with YAML.

[rickard-von-essen]

You can just do:

cat template.yaml | ruby -r json -r yaml -e "yaml = YAML.load(ARGF.read); print yaml.to_json"

[rickard-von-essen]

Duplicates #1047

[mwhooker]

edit: actually I think we want this to be done outside packer regardless

We may in the future however support hcl which supports comments.

[quixand]

I would really like to put comments in my config files without having to process my config files

[hashibot[bot]]

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