Prevent cache evicts files during builds.

[konste]

When I tried to use Build Without Bytes and specify Bazel build flag --remote_download_toplevel I got this error:

ERROR: C:/dev/near/workgroup/managementlibs/src/runjavaservice/BUILD.bazel:11:14: CppLink workgroup/managementlibs/src/runjavaservice/runjavaservice.exe failed: Exec failed due to IOException: Failed to fetch file with hash '17dcab1ff602adafe6c1f3e525f78d5c374f6c047454b22289b3ac0e99bb8d15' because it does not exist remotely. --remote_download_outputs=minimal does not work if your remote cache evicts files during builds.

I am not sure what is going on here, but this part of the error --remote_download_outputs=minimal does not work if your remote cache evicts files during builds. makes me think that we need a way to prevent file evictions during the build. I don't know how, because in my understanding the cache does not know when the builds begin and end.