Add filename structure info to GHA help page

src/_help/continuous-integration/github-actions.md

@@ -218,6 +218,36 @@ jobs:
 > Make sure you adapt the name of the branch your deployment will target, _aka_ your destination branch if relevant (`main` in the example above), replace `<BUMP_HUB_ID>` with your Bump.sh hub slug or id and point `file:` to your local API definition file folder (`docs/`).
 {: .warning}
 
+Please note, by default, only files named `{slug}-api.[format]` are deployed. Where `{slug}` is a name for your API and `[format]` is either `yaml` or `json`. Adjust to your file naming convention using the `filename_pattern:` input.
+
+Note that it _can_ include `*` wildcard special character, but **must** include the `{slug}` filter to extract your documentation’s slug from the filename. The pattern can also have any other optional fixed characters.
+
+Here’s a practical example. Let's assume that you have the following files in your `path/to/apis/` directory:
+
+```
+path/to/apis
+└─ private-api-users-service.json
+└─ partner-api-payments-service.yml
+└─ public-api-contracts-service.yml
+└─ data.json
+└─ README.md
+```
+
+In order to deploy the 3 services API definition files from this folder (`private-api-users-service.json`, `partner-api-payments-service.yml` and `public-api-contracts-service.yml`), you can set call the action like this:
+
+```
+[...]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Deploy API documentation
+        uses: bump-sh/github-action@v1
+        with:
+          hub: <BUMP_HUB_ID>
+          token: ${{secrets.BUMP_TOKEN}}
+          file: docs/
+          filename_pattern: '*-api-{slug}-service'
+```
 
 ## Inputs