Add julia support and example

justfile

@@ -10,12 +10,19 @@ setup:
 test:
     uv run python main.py
 
+# Run code that generates output
+output: ensure-build
+    julia --project=. main.jl
+
 # Build document and open in zathura
-build:
-    rm main.pdf
-    typst compile main.typ
-    zathura main.pdf >/dev/zero 2>&1 & disown
+build: output
+    rm main.pdf || true
+    typst compile main.typ build/main.pdf
+    zathura build/main.pdf >/dev/zero 2>&1 & disown
     
 # Format code in place
 format:
     typstyle -i main.typ
+
+ensure-build:
+    mkdir -p build