Add cache for cbinding

.github/workflows/ci.yml

@@ -100,8 +100,20 @@ jobs:
           os: linux
           nim_version: ${{ env.nim_version }}
 
+      - name: Record submodule commit
+        run: git -C vendor/nim-codex rev-parse HEAD > vendor/logos-storage-nim/.storage-commit
+
+      - name: Cache libstorage build
+        id: cache-libstorage
+        uses: actions/cache@v4
+        with:
+          path: vendor/logos-storage-nim/build
+          key: ${{ runner.os }}-libstorage-${{ hashFiles('vendor/logos-storage-nim/.storage-commit') }}
+
       - name: C Binding build
+        if: steps.cache-libstorage.outputs.cache-hit != 'true'
         run: |
+            make -j${ncpu} update
             make -j${ncpu} libstorage
 
       - name: C Binding test