fix: gha

.github/workflows/test.yml

@@ -40,10 +40,30 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
-      - run: yarn install
-      - run: yarn audit:fix
-      - run: yarn audit signatures
-      - run: yarn test
+      - uses: pnpm/action-setup@v3
+        name: Install pnpm
+        with:
+          version: 8
+          run_install: false
+
+      - name: Get pnpm store directory
+        shell: bash
+        run: |
+          echo "STORE_PATH=$(pnpm store path --silent)" >> $GITHUB_ENV
+
+      - uses: actions/cache@v4
+        name: Setup pnpm cache
+        with:
+          path: ${{ env.STORE_PATH }}
+          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-pnpm-store-
+
+      - name: Install dependencies
+        run: pnpm install
+      - run: pnpm audit signatures
+      - run: pnpm build
+      - run: pnpm test
 
   # separate job to set as required in branch protection,
   # as the build names above change each time Node versions change