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fix: only generate linkage if CARGO_WORKSPACE_DIR is available #552

Job	Run time
renderling-test-linux	4m 57s
install-cargo-gpu (ubuntu-latest)	1m 12s
renderling-build-example	1m 39s
install-cargo-gpu (macos-latest)	47s
renderling-test-macos	2m 2s
install-cargo-gpu (windows-latest)	1m 7s
renderling-test-windows	2m 2s
renderling-clippy	1m 5s
renderling-build-shaders (ubuntu-latest)	3m 23s
renderling-build-shaders (macos-latest)	3m 11s
renderling-build-shaders (windows-latest)	9m 16s
	30m 41s

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