Avoid installer artifact uploads on PR builds

[eimexdev]

Summary

• Keeps pull request CI building both installer packages without uploading the large artifacts.
• Preserves artifact uploads for pushes, manual workflow runs, and release workflow calls.
• Adds a short artifact retention window for non-PR uploads to reduce quota pressure.

Why

The current release-prep PR builds are reaching actions/upload-artifact, then failing because GitHub Actions artifact storage quota is full. PR builds need to prove packaging still works; they do not need to retain 80-110 MB installer artifacts on every run.

Verification

• Workflow-only change. The next PR run should still execute the macOS and Windows build steps, but skip Upload installer artifact on pull_request.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Free

Run ID: a9696d87-c513-40d0-aab9-76d40f463317

📥 Commits

Reviewing files that changed from the base of the PR and between f734c57 and b8503a2.

📒 Files selected for processing (1)

• .github/workflows/build-installers.yml

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