Support human readable diff on docker_config resource

[pwalkr]

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Description

I use docker_config resources for text files in all my use cases. It would be helpful if terraform could show a proper diff of this text on change instead of a diff of the base64 encoded value. I currently have a pattern of using output for each of my docker_config raw values, but this is excessive and noisy.

New or Affected Resource(s)

• docker_config

Potential Terraform Configuration

Instead of using output to get a diff:

resource "docker_config" "prometheus" {
  name = "prometheus"
  data = base64encode(local.prometheus_config)
}

# To get human-readable diff when prometheus_config changes
output "docker_config_prometheus" {
  value = local.prometheus_config
}

It might make sense to accept a data_text or data_raw input that terraform can render as part of standard operation.

resource "docker_config" "prometheus" {
  name     = "prometheus"
  data_raw = local.prometheus_config
}