ci: simplify aarch64-linux cross-compile (CLI-only, skip UI) #8

Job	Run time
build (x86_64-pc-windows-gnu, windows-latest, mhrv-rs-windows-amd64)	7m 19s
build (aarch64-apple-darwin, macos-latest, mhrv-rs-macos-arm64)	5m 0s
build (x86_64-apple-darwin, macos-latest, mhrv-rs-macos-amd64)	3m 43s
build (aarch64-unknown-linux-gnu, ubuntu-latest, mhrv-rs-linux-arm64)	2m 29s
build (x86_64-unknown-linux-gnu, ubuntu-latest, mhrv-rs-linux-amd64)	3m 32s
release	17s
	22m 20s

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