set PROCESSING_ASSET_ROOT with justfile

Author: catilac

justfile

@@ -1,11 +1,13 @@
+export PROCESSING_ASSET_ROOT := `realpath ./assets`
+
 default:
     @just --list
 
 py-build:
     cd crates/processing_pyo3 && uv run maturin develop
 
 py-run file: py-build
-    cd crates/processing_pyo3 && uv run python ../../{{file}}
+    cd crates/processing_pyo3 && uv run python ./examples/{{file}}
 
 wasm-build:
     wasm-pack build crates/processing_wasm --target web --out-dir ../../target/wasm