Support filebase64 function with Noamd

[MatthiasZerau]

Proposal

Please support filebase64 function like it is available for Terraform.

Use-cases

As part of a job specification, I want to provide the content of a file as base64 encoded value via the env stanza.

Attempted Solutions

I've tried the following:

...
task "myTask" {
  ...
  env {
    DATA_BASE64 = base64encode(file(var.data_file))
  }
}

As the file is not UTF-8 encoded it fails with following error:

Error getting job struct: Error parsing job file from exampletask.nomad:
exampletask.nomad:122,56-61: Error in function call; Call to function "file" failed: contents of D:\a\path\to\file.dat are not valid UTF-8; use the filebase64 function to obtain the Base64 encoded contents or the other file functions (e.g. filemd5, filesha256) to obtain file hashing results instead.

(with Nomad 1.1.0)

[lgfa29]

Thank you @MatthiasZerau. I think this function does sound useful in some scenarions. I've set this idea for further triaging.

I'm adding the Terraform docs here for reference:
https://www.terraform.io/docs/language/functions/filebase64.html

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