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ci(cache): add a ci.toml declaring fbuild's cache ceiling (8.73 GiB = 87% of the 10 GiB cap) #510

Job	Run time
Verify local gate	11s
Select boards for changed paths	9s
linux / Check (ubuntu-latest)	4m 18s
linux / Python facade tests (ubuntu-latest)	1m 16s
test	0s
Verified reuse decision (shadow)	0s
full	0s
Build fbuild (shared by board jobs)	-1s
matrix.workflow_name	0s
CI selected coverage	3s
	5m 56s