try fix action

Author: bgkillas

.github/workflows/wasm.yml

@@ -40,6 +40,7 @@ jobs:
 
       - name: Build WASM app
         run: |
+          rustup component add rust-src --toolchain nightly-x86_64-unknown-linux-gnu
           export RUSTUP_TOOLCHAIN=nightly
           wasm-pack build --out-dir www/pkg --target web --release --no-default-features --features "wasm-draw"
           wasm-opt -O3   --enable-bulk-memory   --enable-nontrapping-float-to-int   -o www/pkg/kalc_plot_bg.wasm   www/pkg/kalc_plot_bg.wasm