Rename channel to sample (#21) #107

Job	Run time
test (ubuntu-latest, 1.70.0)	15s
cross-compile-ios (macos-latest, 1.70.0, aarch64-apple-ios)	20s
cross-compile (ubuntu-latest, 1.70.0, aarch64-linux-android)	12s
test (ubuntu-latest, stable)	8s
cross-compile (ubuntu-latest, 1.70.0, i686-pc-windows-gnu)	12s
test (ubuntu-latest, beta)	12s
cross-compile (ubuntu-latest, 1.70.0, i686-unknown-freebsd)	13s
test (ubuntu-latest, nightly)	12s
cross-compile (ubuntu-latest, 1.70.0, i686-unknown-linux-gnu)	14s
test (macos-latest, 1.70.0)	16s
cross-compile (ubuntu-latest, 1.70.0, wasm32-unknown-unknown)	13s
cross-compile (ubuntu-latest, 1.70.0, x86_64-apple-darwin)	17s
test (macos-latest, stable)	11s
cross-compile (ubuntu-latest, 1.70.0, x86_64-unknown-redox)	16s
test (macos-latest, beta)	17s
test (macos-latest, nightly)	17s
test (windows-latest, 1.70.0)	44s
test (windows-latest, stable)	1m 15s
test (windows-latest, beta)	32s
test (windows-latest, nightly)	49s
	7m 5s

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