CI: NGC login for isaac-sim 6.0.1 base pull

[hguillen]

Summary

• Premerge and nightly GPU jobs now docker login nvcr.io with NGC_API_KEY before ./scripts/ci/run_tests.sh.
• Fixes failed to fetch oauth token: denied: Access Denied when building FROM nvcr.io/nvidia/isaac-sim:6.0.1 (anonymous pull worked for 6.0.0-dev2, not this tag).

Test plan

• Confirm repo secret NGC_API_KEY is set on isaac-sim/Isaac-AutoData
• Re-run the failing premerge E2E job (or open/update this PR) and verify NGC login succeeds and the image build progresses past FROM nvcr.io/nvidia/isaac-sim:6.0.1
• Spot-check nightly workflow YAML still has the same login step before the full suite

Summary by CodeRabbit

• Chores
  • Updated automated end-to-end testing workflows to authenticate securely with the container registry.
  • Added validation to stop test runs when required authentication credentials are unavailable.
  • Enabled nightly tests to pull the required simulation environment successfully.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Enterprise

Run ID: b4b9e836-8656-412d-96bf-27c7ce9e29c3

📥 Commits

Reviewing files that changed from the base of the PR and between c704f8a and a89727e.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• .github/workflows/nightly.yml

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📝 Walkthrough

Walkthrough

The CI and nightly E2E workflows now validate NGC_API_KEY and authenticate to nvcr.io before pulling Isaac Sim images.

Changes

NGC E2E authentication

Layer / File(s)	Summary
Authenticate E2E image pulls .github/workflows/ci.yml, .github/workflows/nightly.yml	Both workflows check for an empty NGC_API_KEY, fail explicitly when it is missing, and log in to nvcr.io with the literal $oauthtoken username before E2E execution.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• isaac-sim/Isaac-AutoData#25: Modifies the same CI and nightly workflows for NGC authentication.
• isaac-sim/Isaac-AutoData#33: Modifies the CI E2E setup and container-registry authentication flow.
• isaac-sim/Isaac-AutoData#52: Modifies CI and nightly workflows to use NGC_API_KEY before E2E tests.

Suggested reviewers: njawale42

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the NGC login added for the Isaac Sim 6.0.1 base image pull.
Description check	✅ Passed	The description explains the change, reason, and validation steps, but it omits the required Detailed description heading and an explicit impact statement.
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
• Commit unit tests in branch hguillen/ngc-ci-login

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