Fail to create CNAME file when there's no docs folder in the repo root

[iwismer]

I'm trying to use this action to deploy mkdocs, but I'm running into an error: /action.sh: line 25: /github/workspace/docs/CNAME: No such file or directory which seems to be related to the fact that I don't have a folder docs in the root of my repo, so the script isn't able to create a CNAME file. The relevant lines are: https://github.com/mhausenblas/mkdocs-deploy-gh-pages/blob/master/action.sh#L23-L26

I think there just needs to be some way to specify a custom docs/ folder is for the deployment.