fix(ci): map Dylint UI nightly to verified driver and sysroot

[zackees]

The Linux Dylint UI step still compiled a driver because dylint_testing asks for a short nightly-2026-05-28 directory while Soldr stages the verified binary under nightly-2026-05-28-<host>. Point the short directory at the verified one. The prebuilt driver also forms its sysroot path literally from RUSTUP_HOME/toolchains/$RUSTUP_TOOLCHAIN, so point the short toolchain directory at the installed host-qualified sysroot.

The UI test keeps RUSTUP_TOOLCHAIN=nightly-2026-05-28, matching the lint library artifact tag. Both aliases are Linux-only and apply to the UI fixture step. No driver or tool is compiled from source.

RED -> GREEN: the ban_manual_slash_normalize UI fixture failed locally with a missing driver, then a missing std sysroot, and passed after both aliases were in place. All 21 focused workflow/pin/local lint tests and git diff --check pass.

[coderabbitai]

Navigate logical layers of code changes, visualize relationships, and explore their blast radius.

Note

Currently processing new changes in this PR. This may take a few minutes, please wait...

⚙️ Run configuration

Configuration used: Repository: FastLED/fbuild/.coderabbit.yaml

Review profile: CHILL

Plan: Advanced

Run ID: 9f337b99-0c3f-4845-9391-b49297ae19fb

📥 Commits

Reviewing files that changed from the base of the PR and between 47bcbc0 and 6a1b16a.

📒 Files selected for processing (1)

• .github/workflows/dylint.yml

 _______________________________________
< For a good time, call 1-800-COD-RABT. >
 ---------------------------------------
  \
   \   \
        \ /\
        ( )
      .( o ).

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}