fixes to deploy yaml

.github/workflows/deploy.yml

@@ -14,33 +14,46 @@ jobs:
     steps:
       - uses: actions/checkout@v2
         with:
-          fetch-depth: 2
+          fetch-depth: 2  # Need history to check for changes
+
+      - name: Check for Rust changes
+        id: check_changes
+        run: |
+          # Check if any Rust files or Cargo.toml have changed
+          if git diff --name-only HEAD^ HEAD | grep -qE '\.rs$|Cargo.toml|Cargo.lock'; then
+            echo "rust_changed=true" >> $GITHUB_OUTPUT
+          else
+            echo "rust_changed=false" >> $GITHUB_OUTPUT
+          fi
 
       - name: Install Rust
+        if: steps.check_changes.outputs.rust_changed == 'true'
         uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
           target: wasm32-unknown-unknown
           override: true
-
-      - name: Add WASM target
-        run: rustup target add wasm32-unknown-unknown
-
-      - name: Install dependencies
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y pkg-config libudev-dev libasound2-dev
 
       - name: Install wasm-bindgen-cli
+        if: steps.check_changes.outputs.rust_changed == 'true'
         run: cargo install -f wasm-bindgen-cli --version 0.2.95
 
       - name: Create deployment directory
         run: mkdir -p dist
 
-      - name: Build WASM (with verbose output)
+      - name: Build WASM
+        if: steps.check_changes.outputs.rust_changed == 'true'
+        run: |
+          cargo build --release --target wasm32-unknown-unknown
+          wasm-bindgen --out-dir ./dist/out/ --target web ./target/wasm32-unknown-unknown/release/bevy_compute_shader.wasm
+
+      - name: Copy existing WASM files
+        if: steps.check_changes.outputs.rust_changed == 'false'
         run: |
-          cargo build --release --target wasm32-unknown-unknown -v
-          wasm-bindgen --out-dir ./dist/out/ --target web ./target/wasm32-unknown-unknown/release/bevy_vaporwave.wasm
+          # Get the files from the previous gh-pages build
+          git fetch origin gh-pages
+          git checkout origin/gh-pages -- out
+          cp -r out dist/
 
       - name: Copy web files
         run: |