feat: add Bun 1.4 runtime

[HarshMN2345]

Summary

• Register Bun 1.4 (oven/bun:1.4.0-alpine → openruntimes/bun:v5-1.4)

Published in open-runtimes 0.13.23 (open-runtimes/open-runtimes#551). Image is live on Docker Hub with both amd64 and arm64.

Bun 1.4 brings Node.js 26.3.0 compatibility, parallel test/run, and Windows ARM64 — https://bun.com/blog/bun-v1.4

Test plan

• vendor/bin/phpunit — 11 tests, 1148 assertions, green
• bun-1.4 resolves to openruntimes/bun:v5-1.4
• Docker Hub manifest asserts amd64,arm64

[greptile-apps]

Greptile Summary

Adds Bun 1.4 to the runtime registry.

• Maps bun-1.4 to the Bun 1.4.0 Alpine base image and the corresponding Open Runtimes image.
• Declares support for x86 and ARM64, consistent with existing Bun versions.

Confidence Score: 5/5

The PR appears safe to merge with no actionable defects identified.

The Bun 1.4 entry is self-contained, follows the established runtime registration contract, and is automatically included by the existing generic lookup and enumeration paths.

Important Files Changed

Filename	Overview
src/Runtimes/Runtimes.php	Registers Bun 1.4 using the same image-tag and architecture conventions as the existing Bun runtime versions; no actionable issue was identified.

_{Reviews (1): Last reviewed commit: "feat: add Bun 1.4 runtime" | Re-trigger Greptile}