ci(boil): Fix env var interpolation (#1568) #8

Job	Run time
Create Draft Release	9s
Build boil (x86_64-unknown-linux-gnu, ubuntu-latest)	2m 11s
Build boil (aarch64-unknown-linux-gnu, ubuntu-24.04-arm)	1m 46s
Build boil (aarch64-apple-darwin, macos-latest)	2m 59s
finish-release	2s
	7m 7s

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