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ci: faster release builds - #91
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Release builds compile from scratch, and fat LTO with one codegen unit made the final step over half of that: ~4 of ~7.5 minutes per OS. Thin LTO with the default codegen units cut a cold local build from 207 s to 118 s, for an exe about 3 MB bigger. The Linux package install now keeps the .deb files in the Actions cache, keyed on the exact files apt would download. The runners' Ubuntu mirror took 13-18 minutes for 64 MB twice today, against 20 s normally. release.yml no longer uses rust-cache: a release's cache never survived to the next release, so saving it only cost time and evicted the caches Build and Check reuse.
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Release builds compile from scratch, and fat LTO with one codegen unit made the final step over half of that: ~4 of ~7.5 minutes per OS. Thin LTO with the default codegen units cut a cold local build from 207 s to 118 s, for an exe about 3 MB bigger.
The Linux package install now keeps the .deb files in the Actions cache, keyed on the exact files apt would download. The runners' Ubuntu mirror took 13-18 minutes for 64 MB twice today, against 20 s normally.
release.yml no longer uses rust-cache: a release's cache never survived to the next release, so saving it only cost time and evicted the caches Build and Check reuse.