Add eslinter

Author: tvdijen

.github/workflows/eslinter.yml

@@ -25,8 +25,9 @@ jobs:
           node-version: latest
 
       - name: Install ESLint
-        run: npm install -g npx --save-dev
-        run: npm install -g eslint --save-dev
+        run: |
+          npm install -g npx --save-dev
+          npm install -g eslint --save-dev
 
       - name: Checkout Code
         uses: actions/checkout@v4