fixup! .github/workflows/ci.yml: test Windows on ARM.

Author: dot-asm

.github/workflows/ci.yml

@@ -54,8 +54,8 @@ jobs:
     - name: Rust
       shell: bash
       run: |
-        if ! which cargo > /dev/null 2>&1; then
-            export PATH=$HOME/.cargo/bin:$PATH
+        if [ -d "$HOME/.cargo/bin" ] && ! which cargo > /dev/null 2>&1; then
+            export PATH="$HOME/.cargo/bin:$PATH"
         fi
         rustc --version --verbose
         export CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse