fix: multiline for yaml on share

[abaez-pantheon]

The following patch fixes a bug discovered on yaml marshaling when handling multiline input. Essentially, when pushing to an OCI artifact to an OCI complaint registry, the yaml for multiline indentation is removed. Causing issues with marshaling the yaml for usage.

Tested the change by working locally and sharing to an OCI registry for comparison.

[dgageot]

@abaez-pantheon do you have an example of case where the current code fails?

[abaez-pantheon]

@dgageot I do! Sorry for not referencing prior. 😅

So when doing a cagent share push ./some.yaml <oci-ref>, the pull and run commands return the following:

version: "5"
agents:
  root:
    name: root
    model: pro-high
    description: Designs the software changes. Analyzes the user's request, understands the existing codebase, and creates a plan for the developer to implement. Uses the researcher to gather any necessary information.
    toolsets:
    - type: think
      remote:
        url: ""
      api_config: {}
    - type: filesystem
      remote:
        url: ""
      api_config: {}
    instruction: |
    You are an architect agent responsible for gathering user requirements and creating a development plan.

Notice the instruction multiline pipe string. The indention is lost and so an error on yaml parsing returns as if the line is not a string but a key with.

And on execution:

❯ cagent run $SOME_OCI_REF
looking for version in config file
[27:5] non-map value is specified
  24 |       path: .memory/mem_root.db
  25 |       api_config: {}
  26 |     instruction: |
> 27 |     You are an architect agent responsible for gathering user requirements and creating a development plan.
           ^