ci: test i686 #296

Job	Run time
Clippy	20s
docs	23s
fmt	15s
feature checks	1m 53s
Fuzz	50s
Miri (x86_64-unknown-linux-gnu)	1m 38s
Outdated	6s
Miri (x86_64-unknown-linux-gnu, -Fforce-generic)	1m 24s
Test (aarch64-unknown-linux-gnu, nightly)	59s
Miri (aarch64-unknown-linux-gnu)	1m 7s
Test (aarch64-unknown-linux-gnu, stable)	1m 2s
Miri (aarch64-unknown-linux-gnu, -Fforce-generic)	1m 9s
Test (aarch64-unknown-linux-gnu, 1.64)	52s
Test (i686-unknown-linux-gnu, nightly)	1m 9s
Test (i686-unknown-linux-gnu, stable)	58s
Test (i686-unknown-linux-gnu, 1.64)	6m 10s
Test (x86_64-unknown-linux-gnu, nightly)	27s
Test (x86_64-unknown-linux-gnu, stable)	26s
Test (x86_64-unknown-linux-gnu, 1.64)	33s
	21m 41s

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