Replaced the Kustomize-based Tekton PipelineRun generation pipeline with a Jinja2/Python script

[HuijingHei]

New files created:

• .tekton/templates/pipelinerun.yaml.j2 - Jinja2 template for generating PipelineRun YAML
• .tekton/templates/streams.yaml - Configuration file defining all streams and their settings
• ci/generate-tekton-pipelinerun.py - Python script that generates the PipelineRun files
  Files removed:
• ci/generate-tekton-pipelinerun - Old bash script that required the kustomize binary
• .tekton/base/ directory - All Kustomize base templates
• kustomization.yaml files - Throughout the .tekton/ directory Files modified:
• .tekton/README.md - Updated documentation with new workflow

Key features of the new system:

1. No runtime dependency on kustomize binary
2. Centralized configuration - All stream settings in streams.yaml
3. --check mode - For CI verification that generated files are up to date
4. Stream-specific customizations supported:
   • has_overrides - Whether to generate the on-pull-request-overrides pipeline
   • hermetic - Build isolation setting (default: true, false for branched)
   • on_push_cel_expression - Custom CEL expression (used by rawhide)

Assisted-by: Claude Opus 4.5 Vertex (Anthropic)

[gemini-code-assist]

Code Review

This pull request replaces the Kustomize-based Tekton PipelineRun generation with a Python script and Jinja2 templates. The new approach uses a centralized configuration file (streams.yaml) and a base template (pipelinerun.yaml.j2) to generate resources for various Fedora CoreOS streams. Review feedback suggests improving the Python script's portability by explicitly defining file encodings and enhancing the YAML template's reliability by quoting variable values to prevent parsing errors.

[gemini-code-assist]

The CEL expression should be quoted to ensure it is correctly parsed as a string in YAML, especially since it contains characters like & and == which can be misinterpreted in certain contexts.

    pipelinesascode.tekton.dev/on-cel-expression: '{{ cel_expression }}'

[gemini-code-assist]

The output image URL should be quoted as it contains colons and potentially other characters that can be misinterpreted by YAML parsers if not explicitly treated as a string.

    value: "{{ output_image }}"

[gemini-code-assist]

Quoting the value ensures it is treated as a string by Tekton, which is the expected type for most pipeline parameters.

    value: "{{ image_expires_after }}"

[gemini-code-assist]

The pipeline bundle reference should be quoted to prevent any potential YAML parsing issues with the digest (@sha256:...) or URL characters.

      value: "{{ pipeline_bundle }}"

[joelcapitao]

That's neat ! Thank you for working on this.
I would have splitted the PR into 2 commits 1. the new changes and 2. the removal of all the files that are not needed anymore. That would ease the review process.
The CI jobs already validates that the final generated YAML files are strictly identical.

Also, as a follow-up patch, could you update the Konflux doc accordingly please ? c.f https://github.com/coreos/fedora-coreos-pipeline/blob/main/docs/KONFLUX.md#templating-approach