.github/build: Add step to build certain crates in WebAssembly

.github/workflows/build.yml

@@ -52,6 +52,19 @@ jobs:
           tests=$(nix build .#internalMatrix."$system".\"${{ matrix.nix }}\".attic-tests --no-link --print-out-paths -L)
           find "$tests/bin" -exec {} \;
 
+      - name: Build WebAssembly crates
+        if: runner.os == 'Linux'
+        run: |
+          # https://github.com/rust-lang/rust/issues/122357
+          export RUST_MIN_STACK=16777216
+
+          pushd attic
+          nix develop .# --command -- cargo build --target wasm32-unknown-unknown --no-default-features -F chunking -F stream
+          popd
+          pushd token
+          nix develop .# --command -- cargo build --target wasm32-unknown-unknown
+          popd
+
       # TODO: Just take a diff of the list of store paths, also abstract all of this out
       - name: Push build artifacts
         run: |