Pins Isaac Sim image to previous image from 05/11

[kellyguo11]

Description

Reverts CI image to previous Isaac Sim image from 05/11 as the new image is causing timeouts in our CI.
TODO: investigate failing cause of the new image.

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist

• I have read and understood the contribution guidelines
• I have run the pre-commit checks with ./isaaclab.sh --format
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have updated the changelog and the corresponding version in the extension's config/extension.toml file
• I have added my name to the CONTRIBUTORS.md or my name already exists there

[greptile-apps]

Greptile Summary

This PR stabilises CI by pinning the Isaac Sim image to the known-good 05/11 digest instead of the floating latest-develop tag, and raises the test_articulation.py timeout to account for any added latency with the pinned image.

• .github/workflows/config.yaml: isaacsim_image_tag changes from latest-develop to latest-develop@sha256:0dd49a1121b297dc85eee7777a9c528318683dbe03b29fd01f2059ac1b099301, locking all CI workflows to the 05/11 build.
• tools/test_settings.py: test_articulation.py per-test timeout is doubled from 1500 s to 3000 s, preventing spurious timeout failures under the pinned image.

Confidence Score: 5/5

Safe to merge — both changes are minimal, targeted CI configuration fixes with no impact on production code.

The image digest pin is a well-understood stabilisation technique that makes CI deterministic, and the timeout increase is a conservative adjustment to prevent spurious failures. Neither change touches application logic or test correctness.

No files require special attention.

Important Files Changed

Filename	Overview
.github/workflows/config.yaml	Pins the Isaac Sim CI image from the floating latest-develop tag to a specific digest from 05/11, preventing CI from picking up a broken upstream image.
tools/test_settings.py	Doubles the timeout for test_articulation.py from 1500 s to 3000 s, likely compensating for slower execution observed with the pinned image.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[CI Workflow triggered] --> B[Load config.yaml via yq]
    B --> C{Image tag}
    C -->|Before: latest-develop| D[Pull latest upstream image\n⚠️ may pick up broken image]
    C -->|After: latest-develop@sha256:...| E[Pull pinned 05/11 digest\n✅ stable, reproducible]
    E --> F[Run tests]
    F --> G{test_articulation.py}
    G -->|Before: 1500s timeout| H[May time out on slower image]
    G -->|After: 3000s timeout| I[Sufficient headroom for pinned image]

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_{Reviews (2): Last reviewed commit: "increase timeout" | Re-trigger Greptile}

[greptile-apps]

Temporary pin needs a follow-up tracking item

This digest pin is a good short-term fix, but the PR description and checklist are largely unfilled, making it easy to forget to revert or update the pin once the upstream latest-develop image is healthy again. Consider opening a follow-up issue (or leaving a # TODO: comment referencing the upstream issue) so the floating tag is restored and CI doesn't silently drift further behind the current image over time.