ci: trigger owncloud/docs rebuild on push

[DeepDiver1975]

Summary

• Adds a trigger-docs-build job that fires after a successful push to any tracked branch
• Uses a GitHub App token (scoped to owncloud/docs only) to call workflow_dispatch on owncloud/docs — no PAT required
• Job only runs on push events, skipping PRs to avoid noise

Prerequisite

Before merging, the following org secrets must exist:

• DOCS_TRIGGER_APP_ID
• DOCS_TRIGGER_APP_PRIVATE_KEY

The GitHub App requires Actions: Read & write permission, installed on owncloud/docs only.

Related

• Reusable workflow lives in owncloud/reusable-workflows (trigger-docs-build.yml)

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