[thebeanogamer]

Some fixes I had to manually apply when trying to run the Java builder with rootless Podman.

• Fix container filesystem permissions for rootless podman
• Fully qualify base image path

[kubernetes-prow]

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[Copilot]

Copilot review overview

🟡 Changes recommended

The unconditional Podman-only --userns=keep-id option breaks client generation with Docker.

Review effort: Balanced
Findings: 1

Open (1)

• Apply --userns=keep-id only when running under Podman · New

What changed in this PR

Improves rootless Podman compatibility for the shared OpenAPI client generator, motivated by Java client builds.

Changes:

• Fully qualifies the Maven base image.
• Adds user-namespace mapping and explicit UID:GID settings.

File	Description
openapi/​openapi-generator/​Dockerfile	Uses the fully qualified Docker Hub image name.
openapi/​openapi-generator/​client-generator.sh	Adjusts container user mapping for rootless Podman.

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