fix(ci): remove legacy Travis CI config

[platex-rehor-bot]

Description

Remove the legacy Travis CI configuration files (.travis.yml, .travis/custom_release.sh, .travis/deploy_key.enc) that contain an unsafe remote script execution pattern in the Deploy stage. The deploy job downloaded and executed a shell script from a mutable branch without any commit pin, checksum, or signature verification (CVSS 8.0).

Konflux/Tekton is now the authoritative build and deployment system for this repo, making the Travis CI setup obsolete. Updated README and technical reference docs to reflect the current CI/CD architecture.

RHCLOUD-49644

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Anything reviewers should know?

• The .travis/deploy_key.enc was an encrypted SSH deploy key used by Travis to push builds to the learning-resources-build repo. Since Konflux handles deployment now, this key is no longer needed.
• Recent commit bc4019f already removed a broken Travis badge link from the README, confirming Travis is no longer in active use.
• All 110 existing tests pass. Lint clean.

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Checklist

• Accessibility: color contrast, keyboard nav, screen reader tested (or N/A)
• All PR checks pass locally (build, lint, test)
• No unrelated changes included

AI disclosure

Assisted by: Claude Code

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: c57f5212-8439-41da-a77d-4db4ca053afb

📥 Commits

Reviewing files that changed from the base of the PR and between 5487aff and 6c864fd.

📒 Files selected for processing (5)

• .travis.yml
• .travis/custom_release.sh
• .travis/deploy_key.enc
• README.md
• docs/TECHNICAL_REFERENCE.md

💤 Files with no reviewable changes (2)

• .travis.yml
• .travis/custom_release.sh

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Summary by CodeRabbit

• Documentation
  • Updated deployment documentation to reflect the current Konflux/Tekton pipeline process.
  • Removed outdated Travis CI setup, deployment instructions, diagrams, and file references.
• Chores
  • Removed legacy Travis CI configuration and release automation.

Walkthrough

Travis CI configuration files (.travis.yml and .travis/custom_release.sh) are removed. README.md and docs/TECHNICAL_REFERENCE.md are updated to remove Travis CI references and describe deployment through Konflux/Tekton pipelines, including changes to a CI/CD mermaid diagram and a file reference table.

Changes

Travis CI removal and documentation update

Layer / File(s)	Summary
Remove Travis CI configuration files .travis.yml, .travis/custom_release.sh	Deletes the Travis CI pipeline configuration and the branch-specific custom release script.
Update deployment and CI/CD documentation README.md, docs/TECHNICAL_REFERENCE.md	Replaces Travis CI deployment description with Konflux/Tekton pipeline information. Updates the CI/CD mermaid diagram to remove the Legacy Travis CI branch and relabel Tekton as "Tekton/Konflux". Removes the Travis CI configuration example and the .travis.yml row from the CI/CD files table.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies removal of the legacy Travis CI configuration.
Description check	✅ Passed	The description explains the security issue and migration, links the issue, documents validation, and includes the required checklist and AI disclosure.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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