Add repeatable-builds.sh and test Oswald as well #1917

Job	Run time
Rustfmt	39s
Rustfmt	41s
Rustfmt	41s
Build GS and check the result	3m 56s
Build GS and check the result	2m 46s
Build GS and check the result	2m 54s
cargo check no std	1m 20s
cargo check no std	1m 16s
cargo check no std	1m 16s
resources/scripts/ots_test.sh	54s
resources/scripts/ots_test.sh	53s
resources/scripts/ots_test.sh	53s
cargo test fea-rs	1m 1s
cargo test fea-rs	1m 1s
cargo test fea-rs	1m 1s
Clippy lints	55s
Clippy lints	1m 0s
Clippy lints	1m 0s
fontbe tests	45s
fontbe tests	45s
fontbe tests	45s
fontc tests	57s
fontc tests	57s
fontc tests	57s
tests other than fontbe,fontc	1m 41s
tests other than fontbe,fontc	1m 45s
tests other than fontbe,fontc	1m 45s
	34m 24s

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