Add s390x-unknown-linux-gnu target

[satyamg1620]

Summary

Adds s390x-unknown-linux-gnu (Linux on IBM Z, big-endian) as a supported platform for @tailwindcss/oxide, so it ships a prebuilt binding like the other Linux targets.

The oxide engine is byte-order-correct on big-endian — no code changes were needed, only build/packaging config:

• Register s390x-unknown-linux-gnu in napi.targets + add the @tailwindcss/oxide-linux-s390x-gnu optional dependency
• Add the crates/node/npm/linux-s390x-gnu sub-package
• Add an s390x-unknown-linux-gnu row to the release build matrix (cross-compiled via --use-napi-cross, so no s390x runner is required)

Test plan

Verified on a native s390x host (RHEL, GCC 11.5, Node 24):

• cargo test → 332 passed, 0 failed (extractors, scanner, glob, utf16)
• Built the native binding with
  pnpm run --filter @tailwindcss/oxide build:platform → tailwindcss-oxide.linux-s390x-gnu.node

[greptile-apps]

Confidence Score: 5/5

Safe to merge — all three changed files follow the exact same patterns as existing platform targets with no functional code changes.

Purely additive build/packaging config mirroring existing patterns exactly — no logic changes, no runtime code affected. napi-rs v3 explicitly documents s390x-unknown-linux-gnu as a supported cross-compilation target with --use-napi-cross.

No files require special attention.

_{Reviews (2): Last reviewed commit: "Copy s390x binding into its npm package ..." | Re-trigger Greptile}

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Configuration used: Repository UI

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Run ID: c68c9919-a786-48e7-8a83-8121cc3d557f

📥 Commits

Reviewing files that changed from the base of the PR and between af01dd3 and 525bf54.

📒 Files selected for processing (1)

• .github/workflows/release.yml

🚧 Files skipped from review as they are similar to previous changes (1)

• .github/workflows/release.yml

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Walkthrough

Adds npm packaging metadata and optional dependency wiring for the @tailwindcss/oxide-linux-s390x-gnu native module. Extends the N-API target list and release workflow matrix for s390x-unknown-linux-gnu, including target-specific stripping, cross-compilation flags, binutils installation, and artifact staging.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the main change: adding the s390x-unknown-linux-gnu target.
Description check	✅ Passed	The description is directly related to the changeset and accurately summarizes the new s390x platform support.
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.

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[satyamg1620]

@adamwathan @RobinMalfait Can you please review this PR