Install Rust-related binaries to /usr/local/bin when cargo home is not available

main.sh

@@ -129,9 +129,9 @@ case "${OSTYPE}" in
 esac
 
 cargo_bin="${CARGO_HOME:-"$HOME/.cargo"}/bin"
-mkdir -p "${cargo_bin}"
-# For version check. It is intentional that this is not wrote in GITHUB_ENV.
-export PATH="${cargo_bin}:$PATH"
+if [[ ! -d "${cargo_bin}" ]]; then
+    cargo_bin=/usr/local/bin
+fi
 
 for tool in "${tools[@]}"; do
     if [[ "${tool}" == *"@"* ]]; then