Test Podman 6.1.0 in CI

[Christof Marti (chrmarti)]

Summary

Test the unchanged Podman Feature integration suite with Podman 6.1.0, the latest Podman release, instead of the GitHub runner's Podman 5.8.4.

Session Context

Key decisions and findings from the development session:

• Version-only test workload: The Podman test itself is byte-for-byte identical to main; the PR changes only the conditional CI installation/configuration for that matrix job.
• Latest releases checked: Podman 5.8.6 still embeds Buildah 1.43.2 and reproduces the /tmp/apt.conf.* failure. Podman 6.1.0 embeds Buildah 1.45.0 and passes the unchanged integration test.
• Podman 6 configuration migration: Podman 6 rewrote configuration handling and honors the runner bundle's rootful graphroot. The experiment supplies the equivalent rootless per-user storage configuration, retaining overlay, ignore_chown_errors=true, and fuse-overlayfs.
• Static build adaptation: There is no mgoltzsche/podman-static 6.x release. The experiment builds Podman 6.1.0 using the 5.8.4 recipe with only the Go module/repository path updates required by Podman 6's CNCF repository migration.
• No test workaround: Layers remain enabled and the Feature workloads are unchanged.

Changes

• Build and install a static Podman 6.1.0 binary only for src/test/cli.podman.test.ts.
• Configure rootless per-user storage in the format required by Podman 6.
• Make no changes to the Podman tests or Feature workloads.

CI results

• Podman 6.1.0 / Buildah 1.45.0 passed: https://github.com/devcontainers/cli/actions/runs/32233556192/job/96008438428
• Podman 5.8.6 / Buildah 1.43.2 failed: https://github.com/devcontainers/cli/actions/runs/32232412407/job/96004905227
• Podman 5.5.2 / Buildah 1.40.1 passed: https://github.com/devcontainers/cli/actions/runs/32229108502/job/95994953190

[Copilot]

Pull request overview

This PR restores rootless Podman feature-test reliability on GitHub-hosted runners by overriding a runner-image Podman storage option (overlay.ignore_chown_errors) that breaks APT’s _apt user during feature builds.

Changes:

• Reset the rootless Podman system state on GitHub Actions to start from a clean store.
• Write a minimal user-level storage.conf to set the overlay driver and disable ignore_chown_errors.
• Assert the effective Podman storage option via podman info before running the packaged CLI tests.

Show a summary per file

File	Description
src/test/cli.podman.test.ts	Adds GitHub Actions–specific rootless Podman storage reset + minimal storage.conf override, with a verification assertion before running the Podman feature tests.

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