Enable support for $USE_GDB when running in debug mode.

.cargo/config.toml

@@ -9,15 +9,16 @@ build-std-features = ["compiler-builtins-mem"]
 [env]
 RUST_TARGET_PATH = { value = "kernel", relative = true }
 
-[target.x86_64-kernel]
-runner = "scripts/run.sh"
+# Run in debug mode.
+[target.'cfg(all(target_arch = "x86_64", target_os = "none", debug_assertions))']
+runner = "scripts/run_debug.sh"
 
-[registry]
-default = "gitea"
+# Otherwise we run in release mode.
+[target.'cfg(all(target_arch = "x86_64", target_os = "none", not(debug_assertions)))']
+runner = "scripts/run_release.sh"
+
+# [registry]
+# default = "gitea"
 
 [registries.gitea]
 index = "sparse+https://git.zxq5.dev/api/packages/OsDev/cargo/" # Sparse index
-# index = "https://gitea.example.com/{owner}/_cargo-index.git" # Git
-
-# [net]
-# git-fetch-with-cli = true