fix(desktop): skip self-copy in canary Linux updater manifest step

[Kitenite]

Summary

• Fix canary release workflow failing on Linux with cp: 'latest-linux.yml' and 'latest-linux.yml' are the same file
• The *-linux.yml glob matched latest-linux.yml itself, then tried to copy it to itself

Changes

• Add guards to skip canary-linux.yml and latest-linux.yml in the glob loop so only the versioned source file (e.g. Superset-0.0.1-canary.20260214-linux.yml) gets copied
• Matches the pattern already used in release-desktop.yml

Test Plan

• Trigger a canary release via workflow_dispatch and verify the "Create canary-named copies" step passes

Summary by CodeRabbit

• Chores
  • Improved the release workflow configuration to prevent redundant operations and better document file origins during the canary release process.

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

The canary release workflow's file-copying loop is refined to skip canary-linux.yml and latest-linux.yml files, only process existing source files, and include source file names in logging output. This prevents self-referential manifest copying and improves operational clarity.

Changes

Cohort / File(s)	Summary
Canary Release Workflow .github/workflows/release-desktop-canary.yml	Modified file-copy loop to exclude specific manifest files (canary-linux.yml, latest-linux.yml), add existence checks, and enhance logging with source file identification.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• feat(desktop): add canary build workflow for internal testing #721: Directly related as it originally introduced/managed the canary release workflow that this PR modifies.

Poem

🐰 Hopping through workflows so fine,
No more circles in manifest line,
Files that copy themselves say "nope!"
With better logs, we can see where things came from—
Organized chaos, now a well-planned warren! 🏠

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch kitenite/fix-linux-build-release

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