fix(workflows): add pnpm installing and caching (#12374)

.github/workflows/github-issue-tracker.yml

@@ -58,6 +58,22 @@ jobs:
         with:
           node-version: 22
 
+      - name: Install pnpm
+        uses: pnpm/action-setup@v4
+
+      - name: Get pnpm store directory
+        id: pnpm-cache
+        shell: bash
+        run: echo "STORE_PATH=$(pnpm store path --silent)" >> $GITHUB_OUTPUT
+
+      - name: Cache pnpm dependencies
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.pnpm-cache.outputs.STORE_PATH }}
+          key: ${{ runner.os }}-pnpm-${{ hashFiles('**/pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-pnpm-
+
       - name: Install dependencies
         if: steps.check_time.outputs.should_delay == 'false'
         run: pnpm install