Add build.rs and dev.yml files (#248)

we need to check if our wasi provider bytes have
changed and rebuild, the new build.rs takes care
of this.

Author: makrisoft

build.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("cargo:rerun-if-changed=providers/javy_quickjs_provider_v1.wasm");
+}

dev.yml

@@ -0,0 +1,6 @@
+name: function-runner
+
+type: rust
+
+up:
+  - rust