Add speculative build support: auto-detect and source staging

[rebtoor]

Summary

• Add build.sh auto-detect <project> [stream] command that scans sources.txt files to determine which container images are affected by a given upstream OpenStack project.
• Add Ansible playbooks for Zuul integration: auto-image resolution (resolve-auto-images.yaml) and source staging (stage-zuul-sources.yaml).
• Add comprehensive unit tests for the auto-detect logic (9 tests including consistency validation against all sources.txt files).

This is a lightweight alternative to the OIB Python package from PR #49, implementing only the two features required for speculative testing of upstream OpenStack changes (RHOSRFE-466):

1. Auto-detection: Given a Zuul project (e.g., openstack/tempest), determine which images need rebuilding by parsing sources.txt manifests. Uses exact URL-path matching to avoid false positives.
2. Source staging: Copy Zuul-checked-out (patched) source repositories into container src/ directories so builds use the speculative code instead of pinned hashes.

How it works

When the content provider runs with s2i_ci_images: auto:

1. resolve-auto-images.yaml inspects the Zuul queue to find which external projects triggered the build.
2. For each project, it runs build.sh auto-detect to find affected images.
3. stage-zuul-sources.yaml copies Zuul's patched checkouts into the container build contexts.
4. The normal build proceeds with patched sources.

Dependencies

Depends-On: #85

Made with Cursor

[openshift-ci]

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[centosinfra-prod-github-app]

Merge Failed.

This change or one of its cross-repo dependencies was unable to be automatically merged with the current state of its repository. Please rebase the change and upload a new patchset.
Warning:
Error merging github.com/openstack-k8s-operators/s2i-openstack-containers for 90,a493a1669643a0d8f0514952e8992d0e7278fa6d

[centosinfra-prod-github-app]

Merge Failed.

This change or one of its cross-repo dependencies was unable to be automatically merged with the current state of its repository. Please rebase the change and upload a new patchset.
Warning:
Error merging github.com/openstack-k8s-operators/s2i-openstack-containers for 90,fa821a12ef70a00cb872a522138a365c5441473c

[rebtoor]

Folded into PR #85 — the speculative build support (auto-detect, list-sources, source staging) is now part of the content provider PR.