installing rustc/cargo for mybinder demo #699

Job	Run time
docs	2m 0s
coverage	3m 32s
Rust unit tests (ubuntu-latest)	2m 47s
lint	1m 32s
Rust unit tests (macos-latest)	2m 57s
Rustfmt	14s
Rust unit tests (windows-latest)	4m 4s
test (macos-latest, 3.8)	4m 58s
typecheck	1m 14s
test (macos-latest, 3.9)	6m 58s
test (macos-latest, 3.10)	7m 11s
test (macos-latest, 3.11)	7m 24s
test (macos-latest, 3.12-dev)	6m 46s
test (ubuntu-latest, 3.8)	3m 46s
test (ubuntu-latest, 3.9)	3m 37s
test (ubuntu-latest, 3.10)	3m 31s
test (ubuntu-latest, 3.11)	3m 53s
test (ubuntu-latest, 3.12-dev)	4m 44s
test (windows-latest, 3.8)	6m 13s
test (windows-latest, 3.9)	5m 31s
test (windows-latest, 3.10)	5m 55s
test (windows-latest, 3.11)	6m 51s
test (windows-latest, 3.12-dev)	7m 36s
	1h 43m 14s

Provide feedback