fix(ci): fix pnpm installation

The build script (tools/build.mjs) requires pnpm to be available
when executing `pnpm install` and `pnpm bazel build` commands.
Previously, pnpm was being set up after npm ci and before the build,
which caused the build to fail because pnpm was not available in time.

Changes:
- Move "Setup pnpm" step to run immediately after "Setup Node JS"
- Ensures pnpm is available before any build commands are executed

Author: ricardochl

.github/workflows/ci.yml

@@ -15,6 +15,10 @@ jobs:
           submodules: true
       - name: Setup Node JS
         uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 10.17.1
       - name: Setup Bazel
         uses: bazel-contrib/setup-bazel@4fd964a13a440a8aeb0be47350db2fc640f19ca8 # 0.15.0
         with:
@@ -23,9 +27,5 @@ jobs:
           repository-cache: true
       - name: Install Dependencies
         run: npm ci
-      - name: Setup pnpm
-        uses: pnpm/action-setup@v4
-        with:
-          version: 10.17.1
       - name: Build Docs
         run: npm run build