CLI cannot generate fromTemplate when specification contains file path $refs

[Laupetin]

Describe the bug

When trying to generate with the html-template the process will fail when the specification file uses a $ref element that points to another file.

It will just show the following message and exit (The error message itself unfortunately is not really helpful):

Generator Error: Input is not a correct AsyncAPI document so it cannot be processed.

After adding a bit of logging it seems to me that it fails to resolve the path and cannot load the referenced file.

How to Reproduce

Running the following command will fail:

asyncapi generate fromTemplate ./index.yaml @asyncapi/html-template

when used with the following specification files:

# index.yaml
asyncapi: 2.5.0
info:
  title: Example
  version: 0.1.0
channels:
  user/signedup:
    $ref: subfolder/user-signedup.yaml

# subfolder/user-signedup.yaml
subscribe:
  message:
    description: An event describing that a user just signed up.
    payload:
      type: object
      additionalProperties: false
      properties:
        fullName:
          type: string
        email:
          type: string
          format: email
        age:
          type: integer
          minimum: 18

Expected behavior

The cli manages to generate output using the html-template and the given specification.

Running the generator directly instead of the cli does in fact produce the expected result:

ag index.yaml @asyncapi/html-template

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