Add dev shell within the javascript ffi bindings test

Author: benalleng

.github/workflows/javascript.yml

@@ -29,12 +29,15 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Install Rust 1.85.0
-        uses: dtolnay/rust-toolchain@1.85.0
-
       - name: "Use cache"
         uses: Swatinem/rust-cache@v2
 
+      - name: "Install nix"
+        uses: DeterminateSystems/determinate-nix-action@main
+
+      - name: "Use nix cache"
+        uses: DeterminateSystems/magic-nix-cache-action@main
+
       - name: Install Node
         uses: actions/setup-node@v6
 
@@ -47,4 +50,4 @@ jobs:
         run: cargo install --locked wasm-bindgen-cli --version 0.2.108
 
       - name: "Build and test"
-        run: bash ./contrib/test.sh
+        run: nix develop .#msrv -c ./contrib/test.sh