Allow for custom conda_build_config.yaml and recipe_append.yaml files

This MR introduces a new feature: if a file named conda_build_config.yaml or recipe_append.yaml exist on the recipe directory, alongside meta.yaml, then they are used to build the package instead of the default files available inside this package.

enabled an automatic merge when the pipeline for edb86ac5 succeeds

merged

mentioned in commit 915d94ca