Add some justfile recipes

justfile

@@ -1,2 +1,13 @@
-requirements:
-	uv export --quiet --no-hashes --no-emit-project --output-file requirements_demo.txt
+default:
+    @just --list
+
+build:
+	rm -rf dist/
+	uv build
+
+publish:
+	uv publish
+
+push:
+	git push --tags
+	git push