DeclarativeExecutor passing down empty configs

[adileo]

Steps to reproduce

import airbyte as ab
source = ab.get_source(
    "example-test",
    config={"hello": "world"},
    source_manifest=Path(os.getcwd()) / "mymanifest.yaml",
    streams="*"
)
source.check()

Effects

The YAML is built with {{ config['hello'] }} as an empty string.

Root cause

PyAirbyte/airbyte/_executors/declarative.py

Line 125 in 7eb746b

source_entrypoint = AirbyteEntrypoint(self.declarative_source)

self.declarative_source is accessing self._config_dict that is always empty, apart from components_py. Since the arg parsing is performed later in the execute() before calling the source_entrypoint.run(args)

    def declarative_source(self) -> ConcurrentDeclarativeSource:
        """Get the declarative source object.

        Notes:
        1. Since Sep 2025, the declarative source class used is `ConcurrentDeclarativeSource`.
        2. The `ConcurrentDeclarativeSource` object sometimes doesn't want to be read from twice,
           likely due to threads being already shut down after a successful read.
        3. Rather than cache the source object, we recreate it each time we need it, to
           avoid any issues with re-using the same object.
        """
        return ConcurrentDeclarativeSource(
            config=self._config_dict,
            source_config=self._manifest_dict,
        )

Proposed fix

Promote config_dict in the initialization params of DeclarativeExecutor and use it instead of initializing it as an empty dict.