Tekton pipeline missing optional netrc workspace for dependency fetching

[coderabbitai]

Issue Description

The refactored multiarch-pull-request-pipeline defines an optional netrc workspace that is consumed by the prefetch-dependencies task, but the PipelineRun configurations in the following files do not include this workspace:

• .tekton/odh-pipeline-runtime-minimal-cpu-py311-ubi9-pull-request.yaml
• .tekton/odh-pipeline-runtime-minimal-cpu-py312-ubi9-pull-request.yaml

Impact

If builds ever rely on .netrc credentials, the pipeline run will silently lack them, potentially causing dependency fetch failures.

Suggested Fix

Consider adding the netrc workspace to the PipelineRun configurations:

workspaces:
  - name: git-auth
    secret:
      secretName: '{{ git_auth_secret }}'
  - name: netrc
    secret:
      secretName: '{{ netrc_secret }}'   # or mark as emptyDir if not needed

Alternatively, if dependency fetching never requires netrc credentials, this can be documented or the workspace can be explicitly configured as emptyDir.

Context

This issue was identified during the code review of PR #1501 where the common pipeline was factored out.

References:

• PR: RHOAIENG-30439: tekton: factor out the common multiarch-pull-request-pipeline into its own file #1501
• Review comment: RHOAIENG-30439: tekton: factor out the common multiarch-pull-request-pipeline into its own file #1501 (comment)

Requested by: @jiridanek