message: Disable incremental compilation on CI
  Fixes
diff: @@ -14,9 +14,12 @@ pub(crate) fn build_backend(
  let mut rustflags = env::var("RUSTFLAGS").unwrap_or_default();
  - // Deny warnings on CI
  if env::var("CI").as_ref().map(|val| &**val) == Ok("true") {
  + // Deny warnings on CI
  rustflags += " -Dwarnings";
  +
  + // Disabling incr comp reduces cache size and incr comp doesn't save as much on CI anyway
  + cmd.env("CARGO_BUILD_INCREMENTAL", "false");
  }
  if use_unstable_features {
  