Rust

only install for the current user #140

Job	Run time
Host-side tests (ubuntu-latest, stable)	34s
Build apk (ubuntu-latest, stable, armv7-linux-androideabi)	46s
Host-side tests (ubuntu-latest, nightly)	35s
Build apk (ubuntu-latest, stable, aarch64-linux-android)	45s
Build apk (ubuntu-latest, stable, i686-linux-android)	45s
Build apk (ubuntu-latest, stable, x86_64-linux-android)	47s
Check MSRV (1.70.0)	15s
Build apk (ubuntu-latest, nightly, armv7-linux-androideabi)	44s
clippy	34s
Build-test docs (ubuntu-latest, stable)	30s
formatting	12s
Build-test docs (ubuntu-latest, nightly)	29s
Build apk (ubuntu-latest, nightly, aarch64-linux-android)	45s
Build apk (ubuntu-latest, nightly, i686-linux-android)	45s
Build apk (ubuntu-latest, nightly, x86_64-linux-android)	46s
Build apk (windows-latest, stable, aarch64-linux-android)	2m 4s
Build apk (windows-latest, stable, x86_64-linux-android)	1m 55s
hello_world example on emulator	0s
	13m 11s

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