Custom metadata.yaml location

[barrettj12]

We are interested in using this action to publish Juju docs (which use a similar structure to charm docs).

As it stands, the metadata.yaml file has to be in the root directory of the repository. For Juju, we don't want to have to add a metadata.yaml in the root directory just for this action to work. We'd be happy to place the metadata.yaml in e.g. the docs or .github directories.

I see two solutions:

1. Add an action input to allow a custom metadata.yaml location.

   uses: canonical/upload-charm-docs
   with:
     metadata-location: '.github/docs-config.yaml'

2. Add action inputs to allow specifying the required metadata directly.

   uses: canonical/upload-charm-docs
   with:
     charm-name: 'juju'
     index-page-url: 'https://discourse.charmhub.io/t/juju-olm-documentation/1087'

[barrettj12]

The custom location would also be needed for multi-charm repos where the charm is not located in the root directory, e.g. the juju dashboard charm.