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.

Software/src/.bazelrc

Lines 22 to 25 in dd34bc9

	# Use a local directory as a remote cache. This shares artifacts when switching
	# between git branches or workspaces for the same project.
	# See https://docs.bazel.build/versions/master/remote-caching.html#disk-cache
	build --disk_cache=~/.cache/thunderbots_bazel_disk_cache

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