fix: manually add cache action to ghpage

.github/actions/cache-setup/action.yml

@@ -0,0 +1,27 @@
+name: "Cache setup."
+description: "Speed up pnpm installation and turbo runs with caching."
+branding:
+  icon: "box"
+  color: "blue"
+runs:
+  using: composite
+  steps:
+    - uses: actions/checkout@v4
+    - name: Cache turbo build setup
+      uses: actions/cache@v4
+      with:
+        path: .turbo
+        key: ${{ runner.os }}-turbo-${{ github.sha }}
+        restore-keys: |
+          ${{ runner.os }}-turbo-
+    - name: Install pnpm
+      uses: pnpm/action-setup@v4
+    - name: Install Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: 20
+        registry-url: "https://registry.npmjs.org"
+        cache: "pnpm"
+    - name: Install dependencies
+      run: pnpm install --frozen-lockfile
+      shell: bash