Both workflows had `workspaces: src-tauri -> target`, which tells
rust-cache the workspace lives at src-tauri/ and its target dir is
src-tauri/target. Neither is true: the workspace is defined at the repo
root (Cargo.toml:1–3 — members = ["src-tauri", "crates/*"]), so cargo
walks up and puts artifacts at ./target, not ./src-tauri/target.
Result: the cache action was saving an empty (or wrong) directory on
every run. Every CI run on every OS effectively started from a cold
build, which is the actual reason the Windows job appeared to compile
sqlx from scratch every push — it was compiling sqlx from scratch every
push.
Point the cache at the real workspace root. While here, drop the
`working-directory: src-tauri` on the cargo check step so the command
runs from the workspace root too; cargo finds the same workspace either
way, but running from root is consistent with the cache's view.
Expected impact: Windows check job drops from ~15–25 min cold-every-time
to ~2–3 min on warm runs, matching Linux/macOS behaviour.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Jake
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