Adding build.rs for config file copy and changing render backend to tiny-skia.

build.rs

@@ -0,0 +1,23 @@
+use std::env;
+use std::fs;
+use std::path::PathBuf;
+
+fn main() {
+    let profile = env::var("PROFILE").unwrap();
+    let manifest_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
+    let target_dir = PathBuf::from(&manifest_dir).join("target").join(&profile);
+    
+    // Ensure target directory exists
+    if !target_dir.exists() {
+        fs::create_dir_all(&target_dir).ok();
+    }
+
+    // Copy the file (e.g., config.json) to the target directory
+    let source = PathBuf::from(&manifest_dir).join("src").join("kira_config.toml");
+    let dest = target_dir.join("kira_config.toml");
+    
+    fs::copy(&source, &dest).expect("Failed to copy kira_config.toml");
+    
+    // Optional: Tell Cargo to re-run this script if the source file changes
+    println!("cargo:rerun-if-changed=src/kira_config.toml");
+}