[CI] Enable sccache for multi-arch release builds (Linux + Windows)

[amd-chiranjeevi]

Motivation

Enables sccache for the multi-arch release build pipeline (TheRock core — not PyTorch),

workflow call chain:

multi_arch_release.yml
→ multi_arch_release_{linux,windows}.yml
→ multi_arch_build_{portable_linux,windows}.yml
→ multi_arch_build_{portable_linux,windows}_artifacts.yml

What changed

	Value
Bucket	therock-sccache-{dev,nightly,prerelease}
Region	us-east-1
Account	-
IAM role	-
Key prefix (Linux)	linux/multiarch/v1/
Key prefix (Windows)	windows/multiarch/v1/
cache_type default	sccache

Test Plan

to be updated

Test Result

to be updated

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[amd-chiranjeevi]

needed this patch ROCm/rocm-systems#6239 - without this patch getting errors when build hip-clr on windows log: https://github.com/ROCm/TheRock/actions/runs/27739979092/job/82100969694

[therock-pr-bot]

❌ PR Check — Action Required

Check	Status	Details
🌿 Branch Name	✅ Pass	—
📝 PR Title/Description	❌ Fail	Error: Title does not follow Conventional Commits style. Expected: start with a valid type (feat, fix, docs, …). Desired format: type(optional-scope): short description
⛔ Forbidden Files	✅ Pass	—
🧪 Unit Test	❌ Fail	Error: Source/code files changed without an accompanying unit test. Expected: add at least one test file named like test_<name>.py / test_<name>.cpp (or <name>_test.*). Current: code file(s) changed: build_tools/setup_sccache_rocm.py; no test file found
🔎 pre-commit	❌ Fail	Error: Check concluded with failure.
🚫 Draft PR	🔜 To Be Enabled	—
🚩 Feature Flag	🔜 To Be Enabled	—
📊 Code Coverage	🔜 To Be Enabled	—

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[therock-pr-bot]

🚫 Please fix the failed policies before requesting reviews.

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