Free up additional disk space on GitHub runner #126

Job	Run time
benchcomp-tests	5m 23s
bookrunner	29m 32s
regression (macos-11)	31m 51s
regression (ubuntu-20.04)	33m 34s
regression (ubuntu-22.04)	38m 12s
perf	41m 17s
releasebundle-macos (macos-11)	8m 57s
releasebundle-ubuntu	6s
write-json-symtab-regression	22m 56s
	3h 31m 48s

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