Try to work around #17, take 2.

Author: alexrp

.github/workflows/build.yml

@@ -47,11 +47,16 @@ jobs:
         uses: actions/[email protected]
         with:
           node-version-file: sup/vscode/package.json
-      # TODO: Remove this hack when `code` is made optional.
-      - name: Workaround for issue 6
+      # TODO: Remove this hack.
+      - name: Workarounds for issues 6 and 17
         run: |
           mkdir hack
+
           touch hack/code
+          touch hack/code.exe
+
+          ln -s "$(which npm)" hack/npm.exe
+
           echo "$PWD/hack" >> $GITHUB_PATH
       - name: Check source code and documentation
         run: |