flake: `TestOpenVSCodeDevContainer`

[dannykopping]

https://github.com/coder/coder/actions/runs/14635795329/job/41067529182

=== FAIL: cli TestOpenVSCodeDevContainer/ok_inside_workspace (25.00s)
    clitest.go:75: invoking command: coder --global-config /tmp/TestOpenVSCodeDevContainerok_inside_workspace1765721481/001 open vscode myworkspace --container awesome_buck149
    open_test.go:441: 2025-04-24 07:43:33.762: cmd: read error: match deadline exceeded: context deadline exceeded (wanted newline; got "")
    open_test.go:441: 
        	Error Trace:	/home/runner/work/coder/coder/pty/ptytest/ptytest.go:372
        	            				/home/runner/work/coder/coder/pty/ptytest/ptytest.go:313
        	            				/home/runner/work/coder/coder/cli/open_test.go:441
        	Error:      	read error
        	Test:       	TestOpenVSCodeDevContainer/ok_inside_workspace
        	Messages:   	match deadline exceeded: context deadline exceeded (wanted newline; got "")
    clitest.go:261: command "coder open vscode" exited with error: running command "coder open vscode": list workspace agent containers:
            github.com/coder/coder/v2/cli.(*RootCmd).openVSCode.func1
                /home/runner/work/coder/coder/cli/open.go:120
          - Get "http://localhost:38731/api/v2/workspaceagents/8844e6f9-9c55-4c50-bdfd-357fb12f3712/containers?label=devcontainer.local_folder%3D": context deadline exceeded

[johnstcn]

I took a glance and this test just uses a mock container lister, so this doesn't seem to be a Docker-related flake.