CI ccache rework #912

Job	Run time
build (macos-latest, esp8266, gcc)	32m 28s
build (macos-latest, host, gcc)	20m 50s
build (macos-latest, rp2040, gcc)	17m 58s
build (ubuntu-latest, esp8266, gcc)	18m 28s
build (ubuntu-latest, host, clang, Host)	24m 17s
build (ubuntu-latest, host, gcc)	21m 50s
build (ubuntu-latest, host, gcc64, Host)	21m 32s
build (ubuntu-latest, rp2040, gcc)	19m 45s
build (windows-latest, esp8266, gcc)	9m 5s
build (windows-latest, host, gcc)	28m 51s
build (windows-latest, rp2040, gcc)	8m 47s
	3h 43m 51s

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