docs: clarify file naming (#835)

* Update README.md

* fix workflow

* chore: prettier-fix

* Update .github/workflows/build.yml

---------

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

.github/workflows/build.yml

@@ -64,7 +64,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        configurationFile: [example/renovate-config.js, example/renovate.json]
+        configurationFile:
+          - example/renovate-config.js
+          - example/renovate-config.json
     steps:
       - name: Checkout
         uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4

README.md

@@ -44,13 +44,10 @@ For the available environment variables, see the Renovate [Self-Hosted Configura
 
 ### `configurationFile`
 
-Configuration file to configure Renovate.
-The supported configurations files:
+Configuration file to configure Renovate ("global" config) in JavaScript or JSON format.
+It is recommended to not name it one of the repository configuration filenames listed in the Renovate Docs for [Configuration Options](https://docs.renovatebot.com/configuration-options/).
 
-- one of the configuration files listed in the Renovate Docs for [Configuration Options](https://docs.renovatebot.com/configuration-options/)
-- or a JavaScript file that exports a configuration object
-
-For both of these options, an example can be found in the [example](./example) directory.
+Config examples can be found in the [example](./example) directory.
 
 The configurations that can be done in this file consists of two parts, as listed below.
 Refer to the links to the [Renovate Docs](https://docs.renovatebot.com/) for all options.