MNT: Only overwrite conda-forge.yml if not present
MNT: Only overwrite conda-forge.yml if not present

We should not be overwriting a conda-forge.yml if one is present.

shadowwalkersb/conda-smithy,conda-forge/conda-smithy,ocefpaf/conda-smithy,ocefpaf/conda-smithy,conda-forge/conda-smithy,shadowwalkersb/conda-smithy