ensure output-dir is relative to toml when building with toml

Author: schell

crates/cargo-gpu/src/toml.rs

@@ -110,6 +110,12 @@ impl Toml {
             command: Command::Build(mut build),
         } = Cli::parse_from(parameters)
         {
+            // Ensure that the output directory is relative to the toml file
+            if build.output_dir.is_relative() {
+                let dir = path.parent().expect("no path parent");
+                build.output_dir = dir.join(build.output_dir);
+            }
+
             log::debug!("build: {build:?}");
             build.run();
         } else {