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b0274f3c - Handle Docker exceptions without explanation attribute (#12570)

Handle Docker exceptions without explanation attribute (#12570) ## Summary - add a helper to extract readable messages from Docker exceptions without relying on `explanation` - reuse the helper when wrapping Docker errors so BuildAppError always gets a message and fix a typo in exception handling ## Fixes https://read-the-docs.sentry.io/issues/4883886678/ https://read-the-docs.sentry.io/issues/5030265593/ ------ [Codex Task](https://chatgpt.com/codex/tasks/task_e_69148da42d508320a9d619e573596b09)