Add ccache support #905

Job	Run time
build (macos-latest, esp8266, gcc)	27m 29s
build (macos-latest, host, gcc)	19m 19s
build (macos-latest, rp2040, gcc)	15m 12s
build (ubuntu-latest, esp8266, gcc)	17m 15s
build (ubuntu-latest, host, clang, Host)	23m 30s
build (ubuntu-latest, host, gcc)	22m 33s
build (ubuntu-latest, host, gcc64, Host)	21m 46s
build (windows-latest, esp8266, gcc)	10m 4s
build (ubuntu-latest, rp2040, gcc)	17m 58s
build (windows-latest, host, gcc)	28m 47s
build (windows-latest, rp2040, gcc)	9m 35s
	3h 33m 28s

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