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x/build: sharded iOS builders #23824

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@eliasnaur

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@eliasnaur

Currently, the android/amd64 and android/386 builders run on an Android emulator with a amd64 system image. This is taxing the heavyly loaded mobile builder Mac Mini. It is also inefficient: the emulator builds competes with Android device builds and any concurrent iOS builds. Because builds are slow, android is not in the trybot set, leaving me to often pester CL authors with "this CL broke android".

Is it possible to add (and run) the Android emulator inside the existing docker images used for regular builders and then run android sharded tests as any other GOOS? If so, android/amd64 and android/386 builds would complete much faster, and take some pressure off the mobile device builder.

If the emulator builds are stable enough, android/amd64 (and perhaps android/386) could even join the trybot set, avoiding most (if not all) android specific followup work after a CL is submitted.

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    Buildersx/build issues (builders, bots, dashboards)NeedsInvestigationSomeone must examine and confirm this is a valid issue and not a duplicate of an existing one.mobileAndroid, iOS, and x/mobilenew-builder

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