final fix rust CI

.forgejo/workflows/demo.yaml

@@ -12,6 +12,28 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@v4
     
+    - name: Install Rust
+      run: |
+        curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal
+        echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+        rustup default stable
+    
+    - name: Verify Rust installation
+      run: |
+        rustc --version
+        cargo --version
+    
+    - name: Cache dependencies
+      uses: actions/cache@v4
+      with:
+        path: |
+          ~/.cargo/registry
+          ~/.cargo/git
+          target
+        key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-cargo-
+    
     - name: Build
       run: cargo build --verbose