Upgrade github actions to pnpm

Author: jamesst20

.github/workflows/build.yml

@@ -8,12 +8,17 @@ jobs:
 
     strategy:
       matrix:
-        adapter: ['react', 'vue2', 'vue3']
+        adapter: ['react', 'vue2', 'vue3', 'svelte5']
 
     steps:
       - name: Checkout
         uses: actions/checkout@v1
 
+      - name: Install pnpm
+        uses: pnpm/action-setup@v3
+        with:
+          version: 9
+
       - name: Setup Node.js
         uses: actions/setup-node@v2
         with:
@@ -30,7 +35,7 @@ jobs:
 
       - name: Build Inertia
         run: |
-          npm install
+          pnpm install
           cd packages/core && npm run build
           cd ../${{ matrix.adapter }} && npm run build