ci: ♻️ skip Docker publish CI for forked PRs

[clins1994]

Summary

• Skip the Docker publish job outside the upstream beeper/line repo
• Avoid registry login/push on forked pull requests where GitHub does not expose registry secrets

Fixes #178

Testing

• pre-commit run check-yaml --files .github/workflows/deploy.yml
• git diff --check

[coderabbitai]

📝 Walkthrough

Walkthrough

Added a conditional guard to the build-docker CI job that prevents execution on forked pull requests where Beeper registry secrets are unavailable, preventing login failures during Docker image pushes.

Changes

CI Registry Access Guard

Layer / File(s)	Summary
Docker build job conditional guard .github/workflows/deploy.yml	The build-docker job now includes an if: condition that gates execution to the main repository and contexts where private registry secrets are accessible, skipping the job on forked PRs to prevent login failures.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description clearly relates to the changeset, explaining why the Docker publish job is being skipped and referencing the linked issue.
Linked Issues check	✅ Passed	The PR directly addresses issue #178 by adding a conditional to prevent Docker registry login/push on forked PRs where secrets are unavailable.
Out of Scope Changes check	✅ Passed	All changes in the PR are scoped to the stated objective: adding an if-guard to the build-docker job to skip execution for forked PRs.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title accurately reflects the main change: adding a conditional guard to skip the Docker publish CI job for forked PRs, which matches the changeset's modification to the build-docker job condition.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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