Add opt-in TCP port readiness check for upstream process#130
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This PR introduces a simpler, zero-config alternative to HTTP-based health checks by adding an opt-in TCP port readiness check - Thruster can now simply wait for the upstream process to bind to its target TCP port before booting the main proxy server. Added
WAIT_FOR_TARGET_PORT(default: false) andWAIT_FOR_TARGET_PORT_TIMEOUT(default: 60s) environment variables.