CI: Deploy with pnpm for Next.js site (setup pnpm + cache store, install with pnpm, build with pnpm)

Author: ndbroadbent

.github/workflows/deploy-site.yml

@@ -39,12 +39,28 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '20'
-          cache: npm
-          cache-dependency-path: site/package-lock.json
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: latest
+
+      - name: Get pnpm store directory
+        shell: bash
+        run: |
+          echo "STORE_PATH=$(pnpm store path --silent)" >> $GITHUB_ENV
+
+      - name: Setup pnpm cache
+        uses: actions/cache@v4
+        with:
+          path: ${{ env.STORE_PATH }}
+          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-pnpm-store-
 
       - name: Install site dependencies
         run: |
-          cd site && npm ci
+          cd site && pnpm install --frozen-lockfile
 
       - name: Setup Pages
         uses: actions/configure-pages@v4
@@ -68,7 +84,7 @@ jobs:
           ruby scripts/export_typescript_types.rb
 
       - name: Build with Next.js
-        run: cd site && npm run build
+        run: cd site && pnpm run build
 
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3