[BUG] Build failes due to Bazel 7.0.0 breaking change

[rhaps0dy]

Describe the bug

When building in the default Docker env, the following error comes up

ERROR: /app/envpool/atari/BUILD:20:8: output 'envpool/atari/roms' of //envpool/atari:gen_atari_roms is a directory; dependency checking of directories is unsound
ERROR: /app/envpool/atari/BUILD:20:8: Executing genrule //envpool/atari:gen_atari_roms failed: not all outputs were created or valid

To Reproduce

1. Run make docker-dev
2. Inside the container run make bazel-debug

Expected behavior

The code builds

System info

I reproduced this bug:

• under Orbstack docker on Mac. which is a x86 VM
• in a x86_64 Ubuntu machine.

Reason and Possible fixes

I was able to work around this by setting export USE_BAZEL_VERSION=6.4.0. Then Bazelisk downloads and runs the appropriate Bazel version. I suggest adding that to the documentation.

Bazel 7.0.0 disables version checking for directories and symlinks, because it's unsound. (I gleaned this from this GitHub issue) Envpool has some genrules that output directories.

Checklist

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