ci: add MSRV #1246

Job	Run time
tests (vmm/sandbox, --all-features)	3m 48s
checks (vmm/sandbox, --all-features)	5m 32s
tests (vmm/task, --all-features)	2m 57s
checks (vmm/task, --all-features)	4m 29s
tests (shim, --all-features)	2m 44s
checks (shim, --all-features)	4m 25s
tests (quark, --all-features)	2m 40s
checks (quark, --all-features)	4m 19s
tests (runc, --all-features)	3m 20s
checks (runc, --all-features)	4m 41s
checks (wasm, --features=wasmedge, 0.13.5)	5m 4s
checks (wasm, --features="wasmedge, wasmedge_wasi_nn", 0.13.5)	5m 0s
tests (wasm, --features=wasmedge, 0.13.5)	3m 31s
checks (wasm, --features=wasmtime)	5m 12s
tests (wasm, --features=wasmtime)	4m 9s
	1h 1m 51s

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