Fix Docker resource prefix in test infrastructure

Add DOCKER_RESSOURCE_PREFIX to generated settings.env and use hyphen
separator instead of underscore for cleaner resource names.

Author: nbars

tests/helpers/ref_instance.py

@@ -321,6 +321,9 @@ def is_running(self) -> bool:
 
     def _generate_settings_env(self) -> str:
         """Generate the settings.env file content."""
+        # Use test prefix for Docker resources so they can be identified and cleaned up
+        # The trailing hyphen ensures clean resource names like "ref_e2e_...-entry-123"
+        docker_prefix = f"{self.config.prefix}-"
         return f"""# Auto-generated settings for REF test instance: {self.config.prefix}
 DEBUG={1 if self.config.debug else 0}
 MAINTENANCE_ENABLED={1 if self.config.maintenance_enabled else 0}
@@ -333,6 +336,7 @@ def _generate_settings_env(self) -> str:
 SECRET_KEY={self.config.secret_key}
 SSH_TO_WEB_KEY={self.config.ssh_to_web_key}
 POSTGRES_PASSWORD={self.config.postgres_password}
+DOCKER_RESSOURCE_PREFIX={docker_prefix}
 """
 
     def _generate_docker_compose(self) -> str:

tests/test_config.py

@@ -134,7 +134,7 @@ def to_env_dict(self) -> dict[str, str]:
             "SSH_TO_WEB_KEY": self.ssh_to_web_key,
             "SSH_HOST_PORT": str(self.ssh_port) if self.ssh_port != 0 else "2222",
             "DEBUG": "1",
-            "DOCKER_RESSOURCE_PREFIX": f"{self.resource_prefix}_",
+            "DOCKER_RESSOURCE_PREFIX": f"{self.resource_prefix}-",
             "INSTANCES_CGROUP_PARENT": "",
             "MAINTENANCE_ENABLED": "0",
             "DISABLE_TELEGRAM": "1",