Add generate-ci subcommand to generate CI configuration

Cargo.toml

@@ -71,7 +71,7 @@ cargo-xwin = { version = "0.14.0", default-features = false, optional = true }
 tracing = "0.1.36"
 tracing-subscriber = { version = "0.3.15", features = ["env-filter"], optional = true }
 
-# project scaffolding, maturin new/init
+# project scaffolding, maturin new/init/generate-ci
 dialoguer = { version = "0.10.2", default-features = false, optional = true }
 console = { version = "0.15.4", optional = true }
 minijinja = { version = "0.30.2", optional = true }

src/build_options.rs

@@ -1009,7 +1009,7 @@ pub fn find_bridge(cargo_metadata: &Metadata, bridge: Option<&str>) -> Result<Br
     };
 
     if !(bridge.is_bindings("pyo3") || bridge.is_bindings("pyo3-ffi")) {
-        println!("🔗 Found {bridge} bindings");
+        eprintln!("🔗 Found {bridge} bindings");
     }
 
     for &lib in PYO3_BINDING_CRATES.iter() {
@@ -1025,10 +1025,10 @@ pub fn find_bridge(cargo_metadata: &Metadata, bridge: Option<&str>) -> Result<Br
             }
 
             return if let Some((major, minor)) = has_abi3(cargo_metadata)? {
-                println!("🔗 Found {lib} bindings with abi3 support for Python ≥ {major}.{minor}");
+                eprintln!("🔗 Found {lib} bindings with abi3 support for Python ≥ {major}.{minor}");
                 Ok(BridgeModel::BindingsAbi3(major, minor))
             } else {
-                println!("🔗 Found {lib} bindings");
+                eprintln!("🔗 Found {lib} bindings");
                 Ok(bridge)
             };
         }