Revert "ci: remove wasi-vfs"

This reverts commit f28383a.

.github/workflows/build.yml

@@ -15,6 +15,12 @@ jobs:
     - uses: actions-rust-lang/setup-rust-toolchain@v1
       with:
         toolchain: 1.74.0
+    - name: Cache WASI VFS
+      id: cache-wasi-vfs
+      uses: actions/cache@v4
+      with:
+        path: /usr/local/bin/wasi-vfs
+        key: ${{ runner.os }}-wasi-vfs
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: 3.2
@@ -25,6 +31,12 @@ jobs:
       with:
         node-version: 21
         cache: yarn
+    - name: Install wasi-vfs
+      if: steps.cache-wasi-vfs.outputs.cache-hit != 'true'
+      run: |
+        curl -LO "https://github.com/kateinoigakukun/wasi-vfs/releases/download/v0.5.2/wasi-vfs-cli-x86_64-unknown-linux-gnu.zip"
+        unzip wasi-vfs-cli-x86_64-unknown-linux-gnu.zip
+        mv wasi-vfs /usr/local/bin/wasi-vfs
     - name: Cache ruby.wasm artefacts
       id: cache-ruby-wasm
       uses: actions/cache@v4