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fix: only generate linkage if CARGO_WORKSPACE_DIR is available #551

Job	Run time
renderling-test-linux	5m 16s
renderling-clippy	1m 20s
renderling-build-example	1m 34s
install-cargo-gpu (ubuntu-latest)	53s
install-cargo-gpu (macos-latest)	46s
renderling-test-macos	2m 31s
install-cargo-gpu (windows-latest)	1m 13s
renderling-test-windows	2m 22s
renderling-build-shaders (ubuntu-latest)	7m 59s
renderling-build-shaders (macos-latest)	6m 1s
renderling-build-shaders (windows-latest)	9m 0s
	38m 55s

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