#512 fix(ci): auto-cut staging on every pre-main push (no manual button)

[Anonymous]

Originally created by: adityaharishch

Context

[#511] already merged as manual-only (workflow_dispatch), but the intent is auto-release on every merge to pre-main — no button. This PR does that, safely.

What it does

• Trigger: push to pre-main (+ workflow_dispatch kept for on-demand / dry_run previews).
• No commit-message marker. semantic-release runs on every push and decides for itself: it cuts a new v*-staging.N prerelease when there are releasable commits (feat/fix/perf…) since the last staging tag, and no-ops on chore/docs/ci-only merges. That tag triggers release-build.yml → per-arch DMG → staging channel.

Why this is the safe way to do auto-release

The earlier incident (accidental v1.72.0-staging.6) was not caused by auto-release — it was caused by matching the [staging-release] substring in a commit message you don't control (a squash body quoting the marker fired it). This removes the string match entirely and lets semantic-release judge the commits, which is the canonical pattern and cannot misfire.

Resulting workflow

• Merge a feat/fix to pre-main → staging build cut & published automatically → dogfood on the staging channel → promote pre-main → main when happy.
• Merge a docs/ci-only change → no release.

[Anonymous]

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[Anonymous]

Ticket changed by: adityaharishch

• status: open --> closed