Support daemonless Podman

[mikaelstaldal]

Podman runs daemonless by default, with the podman command capable of managing containers directly.

It would be nice if Testcontainers could support this, which means to run the podman command instead of talking to a daemon. Running without a daemon has security advantages since a Docker/podman daemon allows privilege escalation. Even if you can run the daemon rootless, it is still able to do everything its user can do, making more fine grained sandboxing technologies like AppArmor and BubbleWrap ineffective.

[linghengqian]

I've done the tests in https://github.com/linghengqian/windows-env-testcontainers-test, specifically at https://github.com/linghengqian/windows-env-testcontainers-test/actions/runs/16898523180/job/47873102978, and it even ran the Rooteless Podman CI. Why do you think it's not supported?

name: Podman Test CI
on:
  push:
    branches: [ master ]
  workflow_dispatch:
concurrency:
  group: podman-test-${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
jobs:
  test:
    runs-on: 'windows-2025'
    timeout-minutes: 60
    steps:
      - uses: actions/checkout@v4
      - name: Setup Podman CLI For Windows
        run: |
          winget install --id jazzdelightsme.WingetPathUpdater --source winget
          winget install RedHat.Podman --source winget
          podman machine init
          podman machine start
          "DOCKER_HOST=npipe:////./pipe/podman-machine-default" >> $env:GITHUB_ENV
          "TESTCONTAINERS_RYUK_DISABLED=true" >> $env:GITHUB_ENV
          "PATH=$env:PATH" >> $env:GITHUB_ENV
      - name: Test Docker CLI on Windows Server
        run: |
          docker context ls
          podman run docker.io/library/hello-world:linux
          docker run hello-world:linux
      - uses: actions/setup-java@v4
        with:
          distribution: 'microsoft'
          java-version: '21'
          cache: 'maven'
      - name: Run test with JDK
        run: ./mvnw clean test