Add example to filter services from compose file

README.md

@@ -184,6 +184,18 @@ With a compose file override:
     compose_file: docker-compose.yml > docker-compose.override.yml
 ```
 
+Filtering services by regex:
+
+```yml
+- uses: whoan/docker-build-with-cache-action@v5
+  with:
+    username: whoan
+    password: "${{ secrets.GITHUB_TOKEN }}"
+    registry: docker.pkg.github.com
+    compose_file: docker-compose.yml
+    services_regex: '(service_1|extra_service.*)' # eg: builds services called exactly "service_1" plus the ones which start with "extra_service" and may have extra chars after
+```
+
 ### Example with more options
 
 ```yml