Remove old Trainer operator image build

[sutaakar]

Build it replaced by Konflux.

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in Fixes #<issue number>, #<issue number>, ... format, will close the issue(s) when PR gets merged):
Fixes #

Checklist:

• Docs included if any changes are user facing

Summary by CodeRabbit

• Chores
  • Removed the operator image build and publish workflow.
  • Removed multi-arch build configuration for the controller manager.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

Removal of build and deployment infrastructure files: the GitHub Actions workflow for building and publishing ODH operator images (multi-stage pipeline with Docker/Buildah, registry login, and image validation) and the multi-arch Dockerfile for the trainer-controller-manager.

Changes

Cohort / File(s)

Summary

Build and Deployment Infrastructure Removal .github/workflows/odh-build-and-publish-operator-image.yaml, cmd/trainer-controller-manager/Dockerfile.multiarch

Deleted GitHub Actions workflow containing multi-stage CI pipeline for building and publishing operator images to Quay.io with multi-arch support (linux/amd64, linux/arm64), including environment setup, Go toolchain, Docker metadata generation, Buildah image build, validation steps, and registry push logic. Deleted Alpine/ubi-based multi-arch Dockerfile with ARG TARGETARCH, WORKDIR, COPY, USER, and ENTRYPOINT instructions.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Verify the removal is intentional and understand the replacement build/deployment strategy
• Confirm no active dependencies on these workflows or Dockerfile from other CI/CD configurations

Poem

🐰 The workflows and Dockerfiles bid adieu,
Build scripts simplified, old cleaned for new,
Multi-arch dreams archived with care,
Streamlined pipelines fill the air! ✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change in the PR, which removes the entire ODH operator image build workflow and multi-arch Dockerfile.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 6fea7ab and e8dc0ac.

📒 Files selected for processing (2)

• .github/workflows/odh-build-and-publish-operator-image.yaml (0 hunks)
• cmd/trainer-controller-manager/Dockerfile.multiarch (0 hunks)

💤 Files with no reviewable changes (2)

• .github/workflows/odh-build-and-publish-operator-image.yaml
• cmd/trainer-controller-manager/Dockerfile.multiarch

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (3)

• GitHub Check: pre-commit
• GitHub Check: Generate
• GitHub Check: Test

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[coveralls]

Pull Request Test Coverage Report for Build 20169830104

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 53.654%

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Totals
Change from base Build 20070751636:	0.0%
Covered Lines:	1564
Relevant Lines:	2915

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💛 - Coveralls