CI: Cache node modules

Author: dustinsoftware

.github/workflows/dotnet-core-desktop.yml

@@ -23,6 +23,19 @@ jobs:
       with:
         fetch-depth: 0
 
+    - name: Cache node modules
+      uses: actions/cache@v2
+      env:
+        cache-name: cache-node-modules
+      with:
+        # npm cache files are stored in `~/.npm` on Linux/macOS
+        path: ~/.npm
+        key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-build-${{ env.cache-name }}-
+          ${{ runner.os }}-build-
+          ${{ runner.os }}-
+
     - name: Install .NET Core
       uses: actions/setup-dotnet@v1
       with: