fix: resolve race condition in TestWorkspaceAgent/GoogleCloud #18970
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…nt/GoogleCloud The test was flaky due to a race condition where the agent CLI would start and attempt authentication before the HTTP server's handler was fully initialized. The test server starts immediately but the handler is set asynchronously, creating a window where requests return 404. This fix waits for the server to be ready by making a test request to /api/v2/buildinfo before starting the agent, ensuring the HTTP handler is properly set up. Fixes: coder/internal#778
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The test was flaky due to a race condition where the agent CLI would start and attempt Google Cloud instance identity authentication before the agent was fully inserted into the database.
This fix adds a synchronization point that waits for the agent to be properly inserted into the database before starting the agent CLI, eliminating the race condition.
Fixes: coder/internal#778