Build CI

Implement `audiomixer.MixerVoice.level` as `synthio.BlockInput` #15847

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10 errors

Build pewpew_m4 for en_US took 45.20s and failed

Build pewpew_m4 for de_DE took 12.74s and failed

Build pewpew_m4 for en_GB took 11.59s and failed

Build pewpew_m4 for en_x_pirate took 11.56s and failed

Build pewpew_m4 for es took 11.79s and failed

Build pewpew_m4 for fil took 11.81s and failed

Build pewpew_m4 for fr took 13.08s and failed

Build pewpew_m4 for ID took 12.17s and failed

Build pewpew_m4 for it_IT took 11.87s and failed

Build pewpew_m4 for ja (clean_build) took 43.06s and failed