Investigate Bazel Disk Cache

[Mr-Anyone]

Description of the task

According to bazel, there is a way to save compile outputs. We set a disk cache, and it doesn't seem to be used for some reason.

https://github.com/UBC-Thunderbots/Software/blob/dd34bc9b55d5ef2259a2d8f442ebb9a2142096fb/src/.bazelrc#L22-L25

The line above doesn't do what it say it does.

Reference:

https://bazel.build/remote/caching#disk-cache

It will be nice if someone fix this because rebuild takes a long time!

FYI: in my local machine, the disk cache directory is ~50GB.

Acceptance criteria

• [ ] Fix Bazel Disk Cache