ci: Added workflow cache

.github/workflows/build_pull_request.yml

@@ -75,6 +75,17 @@ jobs:
         with:
           cache-read-only: true
 
+      - name: Restore build cache
+        uses: https://github.com/actions/cache/restore@v3
+        with:
+          path: |
+            src/**/build
+            !src/**/build/outputs
+          key: build-cache-${{ github.event.pull_request.base.sha }}-${{ matrix.chunk }}
+          restore-keys: |
+            build-cache-${{ github.event.pull_request.base.sha }}-
+            build-cache-
+
       - name: Build extensions (chunk ${{ matrix.chunk }})
         env:
           CI_CHUNK_NUM: ${{ matrix.chunk }}