Development guide update (#5255)

Added missed port forwarding option to the development guide.

site/content/en/docs/contributing/development-environment.md

@@ -170,7 +170,7 @@ description: 'Installing a development environment for different operating syste
 - Pull and run OpenPolicyAgent Docker image:
 
   ```bash
-   docker run -d --rm --name cvat_opa_debug openpolicyagent/opa:0.34.2-rootless \
+   docker run -d --rm --name cvat_opa_debug -p 8181:8181 openpolicyagent/opa:0.34.2-rootless \
    run --server --set=decision_logs.console=true --set=services.cvat.url=http://host.docker.internal:7000 \
    --set=bundles.cvat.service=cvat --set=bundles.cvat.resource=/api/auth/rules
   ```