[Bug]: TestDiff is flaky

[apostasie]

What operating system are you running this on?

None

Container

• I am running this inside a container

What happened?

Local, experimental runner.

== FAIL: cmd/lepton/commands/container TestDiff (0.37s)
    diff_test.go:61:
    diff_test.go:61: ======================== Pre-test cleanup ========================
    diff_test.go:61:
    command.go:113: /usr/local/bin/lepton --namespace=cli-test rm -f testdiff-4594df81
    diff_test.go:61:
    diff_test.go:61: ======================== Test setup ========================
    diff_test.go:61:
    command.go:113: /usr/local/bin/lepton --namespace=cli-test run --quiet -d --name testdiff-4594df81 ghcr.io/stargz-containers/alpine:3.13-org sh -euxc touch /a; touch /bin/b; rm /bin/base64
    diff_test.go:61:
    diff_test.go:61: ======================== Test Run ========================
    diff_test.go:61:
    command.go:113: /usr/local/bin/lepton --namespace=cli-test diff testdiff-4594df81
    command.go:113: assertion failed: expression is false: strings.Contains(stdout, compare): Output does not contain: "A /a"
        Command:  /usr/local/bin/lepton --namespace=cli-test diff testdiff-4594df81
        ExitCode: 0
        Stdout:   A /etc/resolv.conf

        Stderr:
        Env:
        SHELL=/bin/bash
        GOFLAGS=-mod=vendor
        BYPATH=/root/go/bin:/usr/local/go/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
        LOGNAME=rootless
        NAMESPACE=cli-test
        BYPWD=/src
        HOME=/home/rootless
        LANG=C.UTF-8
        LEPTON_BRIDGE_IP=10.42.100.1/24
        XDG_SESSION_CLASS=user
        TERM=xterm
        USER=rootless
        SHLVL=1
        GOTOOLCHAIN=local
        XDG_RUNTIME_DIR=/run/user/1001
        GOFIPS140=v1.0.0
        DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1001/bus
        MAIL=/var/mail/rootless
        OLDPWD=/home/rootless
        _=/usr/local/bin/gotestsum
        PATH=/usr/local/go/bin:/root/go/bin:/usr/local/go/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
        PWD=/src/cmd/lepton/commands/container
        DOCKER_CONFIG=/tmp/TestDiff1341755567/001
        LEPTON_TOML=/tmp/TestDiff1341755567/001/lepton.toml

Relevant log output