Feat/use nightly toolchain explicitly #102

Job	Run time
Build SDK (nanos)	2m 2s
Run static analysis (nanos, include_gif)	1m 20s
Build SDK (nanox)	2m 5s
Build SDK	1m 14s
Run static analysis (nanos, testmacro)	1m 20s
Build SDK (nanosplus)	2m 5s
Run static analysis for cargo-ledger	1m 18s
Run static analysis (nanos, ledger_secure_sdk_sys)	1m 54s
Run static analysis (nanos, ledger_device_sdk)	2m 5s
Check code formatting	1m 6s
Run unit and integration tests (nanos)	2m 36s
Run static analysis (nanox, include_gif)	1m 17s
Run unit and integration tests (nanox)	2m 41s
Run static analysis (nanox, testmacro)	1m 20s
Run unit and integration tests (nanosplus)	2m 36s
Run static analysis (nanox, ledger_secure_sdk_sys)	1m 57s
Run static analysis (nanox, ledger_device_sdk)	2m 9s
Run static analysis (nanosplus, include_gif)	1m 20s
Run static analysis (nanosplus, testmacro)	1m 21s
Run static analysis (nanosplus, ledger_secure_sdk_sys)	1m 54s
Run static analysis (nanosplus, ledger_device_sdk)	1m 59s
	37m 39s

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