ci: make the main-image dispatch repo and ref configurable

[d-cs]

The dispatch-main-image job was hard-gated to triggerdotdev/trigger.dev on the main ref. This makes it configurable via repository variables, all defaulting to the current values:

• MAIN_IMAGE_DISPATCH_REPO — the repo allowed to dispatch (default triggerdotdev/trigger.dev).
• MAIN_IMAGE_DISPATCH_REF_PREFIX — the ref-name prefix that dispatches, matched with startsWith(github.ref_name, …) (default main).
• MAIN_IMAGE_DISPATCH_TARGET — the repository_dispatch target (default triggerdotdev/cloud).

The job is additionally gated on github.event_name == 'push'. This is necessary, not just defensive: the gate now keys off github.ref_name rather than the computed image tag, and ref_name is still main when release.yml invokes this workflow via workflow_call during a release — so without the event guard the job would fire during every release and fail on the absent CROSS_REPO_PAT. A version-equality check can't replace it because build-* tags strip the prefix to the version output.

Behaviour note: the intended dispatch paths — push to main, and push of a <prefix>* tag in a downstream repo — are push events and are unchanged. The one case that no longer dispatches is a manual workflow_dispatch run of publish.yml on main (it previously did, via the old version == 'main' check). That path is indistinguishable from a manual release by event name, so push-only is the clean discriminator.

Dispatching still requires CROSS_REPO_PAT, so setting the variables alone doesn't enable anything.

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[coderabbitai]

Walkthrough

This PR updates the GitHub Actions publish workflow to make the dispatch-main-image job's trigger condition configurable. The job now checks github.repository against vars.MAIN_IMAGE_DISPATCH_REPO (defaulting to triggerdotdev/trigger.dev), requires github.event_name == 'push', and uses startsWith(github.ref_name, vars.MAIN_IMAGE_DISPATCH_REF_PREFIX || 'main') instead of comparing a published version output. The repository-dispatch action's repository input is now vars.MAIN_IMAGE_DISPATCH_TARGET (defaulting to triggerdotdev/cloud).

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: making the main-image dispatch repo and ref configurable via variables.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The pull request description is comprehensive and detailed, exceeding the template requirements with technical justification for design decisions.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci-main-image-dispatch-repo-override

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