test(alias): cover RC_HOST alias resolution

[overtrue]

Related

Follow-up test-gap coverage for recent RC_HOST_<ALIAS> environment alias support.

Background

PR #176 added temporary aliases through environment variables so users can run commands such as rc ls myalias without storing credentials in the config file. Existing coverage verified that alias list --json includes an environment alias and redacts credentials, but it did not exercise the primary command-resolution path that loads an alias through AliasManager::get.

Solution

Add a focused CLI integration test for rc --json ls myalias with RC_HOST_myalias pointing at an unused local endpoint. The expected network-class failure proves the command resolved the environment alias and attempted to use its endpoint instead of returning Alias 'myalias' not found.

Validation

• cargo test -p rustfs-cli --test env_alias
• make pre-commit

[Copilot]

Pull request overview

Adds missing CLI integration coverage to ensure RC_HOST_<ALIAS> environment aliases participate in the primary alias resolution path (AliasManager::get) when running a normal command (rc --json ls <alias>), not just alias list --json.

Changes:

• Introduces a helper to generate a local unused endpoint for deterministic network failure.
• Adds an integration test that sets RC_HOST_myalias, runs rc --json ls myalias, and asserts a network-class JSON error (instead of “Alias not found”).

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