QVAC-17340: centralize Vulkan SDK setup for prebuild workflows

[jpgaribotti]

This PR centralizes the shared Vulkan SDK setup used by several addon prebuild workflows into a single composite GitHub Action.

It reduces duplicated workflow logic while preserving structure.

Changes

• Add .github/actions/setup-vulkan-sdk/action.yml to handle:
  • Linux Vulkan SDK download and extraction
  • Linux x64 and arm64 VULKAN_SDK setup
  • Linux arm64 S3-backed Vulkan SDK cache restore/upload
  • Linux Vulkan environment exports
  • Windows Vulkan SDK install
• Update these prebuild workflows to use the shared action instead of inline Vulkan setup steps:
  • prebuilds-qvac-lib-infer-llamacpp-embed.yml
  • prebuilds-qvac-lib-infer-llamacpp-llm.yml
  • prebuilds-qvac-lib-infer-whispercpp.yml
  • prebuilds-lib-infer-diffusion.yml
  • prebuilds-qvac-lib-infer-nmtcpp.yml
• Keep Android host Vulkan SDK setup enabled in the shared action because the llama.cpp-based Android prebuilds still depend on it.

Test Plan

• Ran the prebuilds for the addons on the dedicated branch, observed no errors.

[github-actions]

Tier-based Approval Status

**PR Tier:** TIER1

**Current Status:** ✅ APPROVED

**Requirements:**
- 1 Team Member approval ❌ (0/1)
- 1 Team Lead OR Management approval ✅ (2/1)

**Bypass rule:** Triggered (2+ Team Lead approvals (Tier 1 exception)). This PR is approved regardless of tier.

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*This comment is automatically updated when reviews change.*

[github-actions]

❌ E2E Mobile Test Results - iOS

Overall Status: FAILED
Device Farm Result: UNKNOWN
Platform: iOS
Addon: @qvac/translation-nmtcpp
PR: #1630
Commit: 2365732

Test Summary

Metric	Count
Total Tests	0
✅ Passed	0
❌ Failed	0
⏭️ Skipped	0

Links

• 🔗 Device Farm Run: View on AWS Device Farm
• 🔗 Workflow: View Details
• 📋 Run ARN: N/A

---

Automated E2E mobile testing powered by AWS Device Farm
Tests located in: test/mobile/

[github-actions]

❌ E2E Mobile Test Results - Android

Overall Status: FAILED
Device Farm Result: UNKNOWN
Platform: Android
Addon: @qvac/translation-nmtcpp
PR: #1630
Commit: 2365732

Test Summary

Metric	Count
Total Tests	0
✅ Passed	0
❌ Failed	0
⏭️ Skipped	0

Links

• 🔗 Device Farm Run: View on AWS Device Farm
• 🔗 Workflow: View Details
• 📋 Run ARN: N/A

---

Automated E2E mobile testing powered by AWS Device Farm
Tests located in: test/mobile/

[github-actions]

❌ E2E Mobile Test Results - iOS

Overall Status: FAILED
Device Farm Result: UNKNOWN
Platform: iOS
Addon: @qvac/translation-nmtcpp
PR: #1630
Commit: 5a5ea01

Test Summary

Metric	Count
Total Tests	0
✅ Passed	0
❌ Failed	0
⏭️ Skipped	0

Links

• 🔗 Device Farm Run: View on AWS Device Farm
• 🔗 Workflow: View Details
• 📋 Run ARN: N/A

---

Automated E2E mobile testing powered by AWS Device Farm
Tests located in: test/mobile/

[github-actions]

❌ E2E Mobile Test Results - Android

Overall Status: FAILED
Device Farm Result: UNKNOWN
Platform: Android
Addon: @qvac/translation-nmtcpp
PR: #1630
Commit: 5a5ea01

Test Summary

Metric	Count
Total Tests	0
✅ Passed	0
❌ Failed	0
⏭️ Skipped	0

Links

• 🔗 Device Farm Run: View on AWS Device Farm
• 🔗 Workflow: View Details
• 📋 Run ARN: N/A

---

Automated E2E mobile testing powered by AWS Device Farm
Tests located in: test/mobile/

[github-actions]

❌ E2E Mobile Test Results - iOS

Overall Status: FAILED
Device Farm Result: UNKNOWN
Platform: iOS
Addon: @qvac/translation-nmtcpp
PR: #1630
Commit: 5a5ea01

Test Summary

Metric	Count
Total Tests	0
✅ Passed	0
❌ Failed	0
⏭️ Skipped	0

Links

• 🔗 Device Farm Run: View on AWS Device Farm
• 🔗 Workflow: View Details
• 📋 Run ARN: N/A

---

Automated E2E mobile testing powered by AWS Device Farm
Tests located in: test/mobile/

[github-actions]

❌ E2E Mobile Test Results - Android

Overall Status: FAILED
Device Farm Result: UNKNOWN
Platform: Android
Addon: @qvac/translation-nmtcpp
PR: #1630
Commit: 5a5ea01

Test Summary

Metric	Count
Total Tests	0
✅ Passed	0
❌ Failed	0
⏭️ Skipped	0

Links

• 🔗 Device Farm Run: View on AWS Device Farm
• 🔗 Workflow: View Details
• 📋 Run ARN: N/A

---

Automated E2E mobile testing powered by AWS Device Farm
Tests located in: test/mobile/