feat: add SSH keepalive defaults (ServerAliveInterval/ServerAliveCountMax)#885
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feat: add SSH keepalive defaults (ServerAliveInterval/ServerAliveCountMax)#885
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Set ServerAliveInterval=10 and ServerAliveCountMax=3 as defaults for all Coder SSH connections. This detects dead connections within ~30 seconds, which helps keep sessions alive through NATs and firewalls. Also renames SSHValues to SshValues for consistency and extracts a shared BASE_SSH_VALUES test fixture to reduce boilerplate across tests.
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ServerAliveInterval=10andServerAliveCountMax=3as defaults for all Coder SSH connections. This detects dead connections within ~30 seconds, helping keep sessions alive through NATs and firewalls.SSHValuestoSshValuesfor naming consistency.BASE_SSH_VALUEStest fixture to reduce boilerplate (net -67 lines in tests).