Windows docker image build fails in CI

[tustanivsky]

Microsoft dropped Windows SDK 10.0.20348 which is one of the prerequisites that ue4-docker tool needs to install in order to build the engine in CI. Without it UE Windows docker image build fails with the following error:

Platform Win64 is not a valid platform to build. Check that the SDK is installed properly and that you have the necessary platform support files (DataDrivenPlatformInfo.ini, SDK.json, etc).

Potential workaround is to override the list of required dependencies in ue-docker-windows.yml as it was done previously for Visual Studio build tools.

Another problem is that UE 5.7 uses UnrealBuildAccelerator by default and some of its dependencies are also missing:

 Unhandled exception: DllNotFoundException: Unable to load DLL 'UbaHost' or one of its dependencies: The specified module could not be found. (0x8007007E)
   at EpicGames.UBA.Impl.ConfigImpl.Config_Load(String configFile)
   at UnrealBuildTool.UBAExecutor.ExecuteActionsAsync(IEnumerable`1 inputActions, ILogger logger, IActionArtifactCache actionArtifactCache) in C:\UnrealEngine\Engine\Source\Programs\UnrealBuildTool\Executors\UnrealBuildAccelerator\UBAExecutor.cs:line 380
   at UnrealBuildTool.UBAExecutor.ExecuteActionsAsync(IEnumerable`1 inputActions, ILogger logger, IActionArtifactCache actionArtifactCache) in C:\UnrealEngine\Engine\Source\Programs\UnrealBuildTool\Executors\UnrealBuildAccelerator\UBAExecutor.cs:line 338
   at UnrealBuildTool.ActionGraph.ExecuteActionsAsync(BuildConfiguration BuildConfiguration, List`1 ActionsToExecute, List`1 TargetDescriptors, ILogger Logger, IActionArtifactCache actionArtifactCache) in C:\UnrealEngine\Engine\Source\Programs\UnrealBuildTool\System\ActionGraph.cs:line 459
   at UnrealBuildTool.BuildMode.BuildAsync(TargetMakefile[] Makefiles, List`1 TargetDescriptors, BuildConfiguration BuildConfiguration, BuildOptions Options, FileReference WriteOutdatedActionsFile, ILogger Logger, String ActionTypeFilter) in C:\UnrealEngine\Engine\Source\Programs\UnrealBuildTool\Modes\BuildMode.cs:line 833
   at UnrealBuildTool.BuildMode.BuildAsync(List`1 TargetDescriptors, BuildConfiguration BuildConfiguration, ISourceFileWorkingSet WorkingSet, BuildOptions Options, FileReference WriteOutdatedActionsFile, ILogger Logger, Boolean bSkipPreBuildTargets, String ActionTypeFilter) in C:\UnrealEngine\Engine\Source\Programs\UnrealBuildTool\Modes\BuildMode.cs:line 417
   at UnrealBuildTool.BuildMode.ExecuteAsync(CommandLineArguments Arguments, ILogger Logger) in C:\UnrealEngine\Engine\Source\Programs\UnrealBuildTool\Modes\BuildMode.cs:line 253
   at UnrealBuildTool.UnrealBuildTool.Main(String[] ArgumentsArray) in C:\UnrealEngine\Engine\Source\Programs\UnrealBuildTool\UnrealBuildTool.cs:line 653

This can be fixed by disabling UBA in build options: https://github.com/EpicGames/UnrealEngine/compare/5.7...getsentry:UnrealEngine:5.7

[linear]

UNREAL-105

[tustanivsky]

The issue with missing dependencies is expected to be addressed via adamrehn/ue4-docker#384.

[tustanivsky]

One more issue that came during attempts to pre-build UE 5.7 Windows docker image in GitHub CI is its 6 hours limit for a single job which causes ue-docker-windows.yml workflow to fail. While the engine build after applying the aforementioned patches is successful there's not enough time to complete resulting image push to Sentry's GitHub package registry (~1 hour).

Splitting the process into smaller jobs and caching the intermediate build-prerequisites and source images doesn’t help either. These images are very large (the latter is 97 GB), and pulling them from ghcr to produce the final artifact takes roughly as long as building them from scratch.

[tustanivsky]

To work around this, UE 5.7 Windows docker image was pre-built on a local dev machine and pushed to GitHub package registry directly.