Desktop appcast endpoint fails to match new macOS release tag format

[atlas-agent-omi]

Problem

The /v2/desktop/appcast.xml endpoint in backend/routers/updates.py fails to recognize new desktop release tags that use a 2-component version format.

Current Behavior

The _parse_desktop_version() regex requires the format:

v{major}.{minor}.{patch}+{build}-{platform}

This matches tags like:

• ✅ v1.0.77+464-desktop-cm
• ✅ v0.11.38+11038-macos

But fails to match newer tags like:

• ❌ v11.0+11000-macos
• ❌ v11.3+11003-macos

These newer tags use the format:

v{major}.{minor}+{build}-{platform}

Impact

Desktop releases using the 2-component version format are not included in the appcast feed, preventing auto-updates for users.

Solution

Update the regex pattern in _parse_desktop_version() to make the patch version optional:

# OLD (broken):
pattern = r'^v?(\d+)\.(\d+)\.(\d+)\+(\d+)-(?:desktop|macos|windows|linux)(?:-(?:cm|auto))?$'

# NEW (fixed):
pattern = r'^v?(\d+)\.(\d+)(?:\.(\d+))?\+(\d+)-(?:desktop|macos|windows|linux)(?:-(?:cm|auto))?$'

Then default the patch version to 0 when not present.

Affected Tags

git tag --list | grep -E '^v11\.\[0-9\]+\+' 
v11.0+11000-macos
v11.1+11001-macos
v11.2+11002-macos
v11.3+11003-macos