Caching
What carries over in a snapshot?
Quick answer
The entire filesystem at snapshot time — installed packages, built extensions, toolchain directories and warm page cache.
The detail that matters
Secrets and job-specific environment variables do not, and should not. Never snapshot after a step that wrote a credential to disk.
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Related
Why does Cargo rebuild everything?Your cache key changes on every run, or target/ is not cached at all.Why is cache restore slow?GitHub throttles cache bandwidth, so a multi-gigabyte cache can take minutes to restore.How do I write a good cache key?Hash exactly the files that determine the cached content — usually the lockfile — and nothing else.What are restore-keys?Ordered prefixes tried when the exact cache key misses, so a partial match can still be restored.