ci: add rust-cache action #1405

Job	Run time
Android (ubuntu-latest, aarch64-linux-android)	9m 0s
Lint	6m 4s
cargo-deny	1m 12s
Test (windows-latest)	20m 38s
Compiletest (windows-latest)	19m 46s
Difftest (windows-latest)	23m 19s
Test (macOS-latest)	17m 49s
Difftest (macOS-latest)	19m 14s
Test (ubuntu-latest)	11m 23s
Compiletest (macOS-latest)	14m 41s
Difftest (ubuntu-latest)	11m 44s
Compiletest (ubuntu-latest)	8m 10s
test_success	2s
Compiletest (ubuntu-latest)	6m 21s
Lint	6m 1s
Difftest (ubuntu-latest)	11m 8s
Difftest (windows-latest)	21m 18s
cargo-deny	1m 2s
Test (windows-latest)	9m 46s
Test (macOS-latest)	9m 21s
Compiletest (windows-latest)	16m 4s
Test (ubuntu-latest)	4m 34s
Difftest (macOS-latest)	16m 11s
Android (ubuntu-latest, aarch64-linux-android)	2m 18s
Compiletest (macOS-latest)	7m 28s
test_success	2s
	4h 34m 36s

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