Install extism-js

Author: Ovenoboyo

.github/workflows/build.yaml

@@ -29,6 +29,11 @@ jobs:
         with:
           packages: make binaryen
 
+      - name: Install extism-js
+        run: |
+          curl -O https://raw.githubusercontent.com/extism/js-pdk/main/install.sh
+          bash install.sh
+
       - name: install Rust stable
         uses: dtolnay/rust-toolchain@stable
         with: