Feature request: Add support for adding extra_config without removing the existing one

[jtobard]

Feature Request

Terraform Version

Terraform v1.0.0

Affected Resource(s)

Please list the resources as a list, for example:

• rundeck_project

Expected Behavior

The request is to have a smarter way to update the project configuration, with a new optional field, similar to extra_config, let's call it append_config that for each line of append_config it replaces only the values whose key exists and adds the new lines, without replacing the ones that are not have included.

The objective of this is to be able to add new global variables (as an example) to the project without having to repeat the extra_config and without the risk of deleting current variables by not including them.

Actual Behavior

You can only use extra_config but using that you need to always use the entire existent extra config.

[rihenperry]

Is this available to use ?