chore(.github/workflows): update cname in swagger-ui workflow

Updated the cname in the swagger-ui workflow from 'api.mainflux.io' to 'apidocs.magistrala.abstractmachines.fr/' for publishing.

Signed-off-by: Rodney Osodo <[email protected]>

.github/workflows/swagger-ui.yaml

@@ -28,4 +28,4 @@ jobs:
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: swagger-ui
-          cname: api.mainflux.io
+          cname: apidocs.magistrala.abstractmachines.fr