tests

Import MSRV stuff from png_pong #93

Job	Run time
cross-compile (ubuntu-latest, 1.70.0, aarch64-linux-android)	19s
test (ubuntu-latest, 1.70.0)	15s
cross-compile (ubuntu-latest, 1.70.0, i686-pc-windows-gnu)	14s
cross-compile-ios (macos-latest, 1.70.0, aarch64-apple-ios)	17s
test (ubuntu-latest, stable)	14s
cross-compile (ubuntu-latest, 1.70.0, i686-unknown-freebsd)	18s
test (ubuntu-latest, beta)	11s
cross-compile (ubuntu-latest, 1.70.0, i686-unknown-linux-gnu)	15s
test (ubuntu-latest, nightly)	13s
cross-compile (ubuntu-latest, 1.70.0, wasm32-unknown-unknown)	14s
test (macos-latest, 1.70.0)	17s
cross-compile (ubuntu-latest, 1.70.0, x86_64-apple-darwin)	16s
test (macos-latest, stable)	11s
cross-compile (ubuntu-latest, 1.70.0, x86_64-unknown-redox)	14s
test (macos-latest, beta)	17s
test (macos-latest, nightly)	18s
test (windows-latest, 1.70.0)	51s
test (windows-latest, stable)	1m 2s
test (windows-latest, beta)	35s
test (windows-latest, nightly)	30s
	7m 1s

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