test: explicitly process bootc templates

[copejon]

Summary

• Adds explicit processing for shared bootc templates from image-blueprints-bootc/templates/ directory
• Templates are processed after package-specific templates but before mirror registry
• Respects existing FORCE_REBUILD logic to skip already-processed templates

Fixes: USHIFT-6788

Test plan

• Verify bootc image build processes templates from the shared templates directory
• Verify existing template processing behavior is unchanged
• Verify FORCE_REBUILD flag works correctly for shared templates

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro

Run ID: ab9a3d06-2ab1-4756-850a-0258b9ffe65d

📥 Commits

Reviewing files that changed from the base of the PR and between 7b2121a and e84acfe.

📒 Files selected for processing (1)

• test/bin/pyutils/build_bootc_images.py

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Walkthrough

Added a pre-build templating step in main() that scans image-blueprints-bootc/templates for *.template files, renders them to BOOTC_IMAGE_DIR with the .template suffix stripped, and conditionally skips rendering if the output file exists and FORCE_REBUILD is false.

Changes

Cohort / File(s)	Summary
Build bootc images templating test/bin/pyutils/build_bootc_images.py	Added template rendering loop that scans for *.template files in image-blueprints-bootc/templates, renders outputs to BOOTC_IMAGE_DIR, and skips if file exists and FORCE_REBUILD is false. Loop positioned after package-sources-bootc processing and before mirror_registry.sh invocation.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: copejon

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[openshift-ci]

@copejon: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-tests-bootc-periodic-el10	e84acfe	link	true	/test e2e-aws-tests-bootc-periodic-el10
ci/prow/e2e-aws-tests-bootc-arm-el10	e84acfe	link	true	/test e2e-aws-tests-bootc-arm-el10
ci/prow/e2e-aws-tests-periodic	e84acfe	link	true	/test e2e-aws-tests-periodic
ci/prow/e2e-aws-tests	e84acfe	link	true	/test e2e-aws-tests
ci/prow/e2e-aws-tests-bootc-arm-el9	e84acfe	link	true	/test e2e-aws-tests-bootc-arm-el9
ci/prow/e2e-aws-tests-bootc-periodic-el9	e84acfe	link	true	/test e2e-aws-tests-bootc-periodic-el9
ci/prow/e2e-aws-tests-bootc-el10	e84acfe	link	true	/test e2e-aws-tests-bootc-el10
ci/prow/e2e-aws-tests-bootc-periodic-arm-el9	e84acfe	link	true	/test e2e-aws-tests-bootc-periodic-arm-el9
ci/prow/e2e-aws-tests-bootc-periodic-arm-el10	e84acfe	link	true	/test e2e-aws-tests-bootc-periodic-arm-el10
ci/prow/e2e-aws-tests-bootc-el9	e84acfe	link	true	/test e2e-aws-tests-bootc-el9

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[ggiguash]

Please remove the issue ID from the comment. We do not usually do this unless it's a TODO item.

[ggiguash]

This code is almost a duplicate of a block from process_group function.
Let's refactor it into process_template_files and call from both places?