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Closing a query early could leak the query goroutine if the buffer isn't large
enough to fit the rest of the query.

add GetSize function

check error before defer-removing disk usage file

use standard CI script

all: gofmt

Run standard gofmt command on project root.

gx update go-log

Use JSON file for `diskUsage.cache` and include note on accuracy of value

Also sync contents of diskUsage.cache to disk after the initial calculation
and during shutdown.

This simplifies the code with perhaps a slightly higher overhead during
write operations.

This now means that the datastore needs to be properly closed, to clean up
the background thread.