make ci pass with properly _tainted_ child dep

Author: ryoqun

banking-bench2/Cargo.toml

@@ -9,7 +9,11 @@ license = { workspace = true }
 edition = { workspace = true }
 
 [dependencies]
-solana-banking-bench = { workspace = true }
+solana-banking-bench = { workspace = true, features = ["dev-utils"] }
 
 [package.metadata.docs.rs]
 targets = ["x86_64-unknown-linux-gnu"]
+
+[features]
+dev-utils-ci-marker = ["dev-utils"]
+dev-utils = []