#18 Add linux_arm64 Chrome packaging for Docker/arm64

[Anonymous]

Originally created by: Luen

Summary

• Add linux_arm64 as a first-class platform alongside linux (amd64).
• Record Google _arm64.deb URLs in the Linux update check (available for recent stables; older majors 404 and are cleared per-OS during sync).
• Sync/rebundle arm64 debs to chrome_<ver>_linux_arm64.tar.gz and upload release assets.
• Update @ulixee/chrome-app (1.0.5) so Linux arm64 hosts download linux_arm64 assets instead of the amd64 linux tarball.
• Fix Debian 404 handling to clear only the missing OS key (do not wipe amd64 when arm64 is absent).

Why

Google publicly released Chrome for linux-arm64 on 2026-07-30 (see https://issues.chromium.org/issues/374811603). Cypress and others are adding arm64 Chrome Docker support; Ulixee Cloud images need matching chrome-versions assets first.

Test plan

• [x] yarn build succeeds
• [x] Downloaded google-chrome-stable_151.0.7922.75-1_arm64.deb and ran rebundleDeb
• [x] Produced chrome_151.0.7922.75_linux_arm64.tar.gz
• [x] Extracted chrome binary is ELF 64-bit LSB pie executable, ARM aarch64

Follow-ups

• Publish @ulixee/chrome-app@1.0.5 after merge so consumers pick up platform detection.
• Sync workflow will publish linux_arm64 assets for Chrome versions Google still hosts as arm64 debs (typically 151+).
• Hero/Cloud still need a Chrome major with arm64 binaries before ulixee-cloud arm64 images are fully usable end-to-end.