Feature Request: Make exchange-manager.properties file location configurable via ENV variable or config property

[whitepowder]

Problem

Trino always expects exchange-manager.properties to be located at /etc/trino/exchange-manager.properties.
This path is hardcoded in ExchangeManagerRegistry.java and cannot be configured.

In Kubernetes and container setups this is limiting because:

• Config files could be injected dynamically (Vault Agent, Helm, Secrets).
• /etc/trino may be cleared or overwritten.

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Proposed Solution

Allow a custom location for the exchange-manager.properties file, for example:

1. Environment variable
   TRINO_EXCHANGE_MANAGER_CONFIG=/path/to/exchange-manager.properties

2. Config property in config.properties
exchange-manager.config-file=/path/to/exchange-manager.properties

If nothing is set, keep the current default /etc/trino/exchange-manager.properties for backward compatibility.

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Why

• Easier integration with Vault Agent and Kubernetes secrets.
• No need to overwrite /etc/trino inside containers.
• Consistent with access control, which already supports custom file locations via security.config-file.
• Removes the limitation of a hardcoded path in ExchangeManagerRegistry.java.