Revert "Temporarily disable CircleCI building"
Revert "Temporarily disable CircleCI building"

The problem has been analyzed, so we enable CircleCI again.

This reverts commit adc61a8f57f38196483dfb5e20ea2e94f1a6551e.
This reverts commit efba963910f3f556cc68e172f2e5689487b81386.

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