After the candle deps were added, cargo builds run long enough that
the parallel fmt/clippy/test jobs (all on the `rust` runner label,
which appears to use act in host-executor mode) start racing each
other's intermediate temp files under
/root/.cache/act/<hash>/hostexecutor/target/debug/deps/
Concretely the test job hit:
error: No such file or directory at path
"target/debug/deps/.tmprlicL7"
Compiling unicode-ident
because another job's cargo invocation cleaned up the temp file
mid-compile. fmt and clippy happened to finish without their own
target races landing fatally, so only test failed visibly.
Set CARGO_TARGET_DIR=target-${{ github.job }} at the workflow level
so each job writes to its own target directory. sccache still backs
the actual rustc cache, so the rebuild penalty is just metadata not
full recompiles.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
rob thijssen
6d2dc5ff1a
