Made makefile more readable and autodetect if frontend needs to be rebuilt

Makefile

 APP_LIST ?= core grady util
 DB_NAME = postgres
 
-.PHONY: run install migrations-check isort isort-check test
+.ONESHELL:
+
+.PHONY: run install migrations-check isort isort-check test teste2e
 
 run:
 	python manage.py runserver 0.0.0.0:8000
@@ -21,14 +23,19 @@ migrate:
 test:
 	pytest --ds=grady.settings core/tests
 
-teste2e:
-	cd frontend && yarn build && cp dist/index.html ../core/templates && cd .. && python util/format_index.py && python manage.py collectstatic --no-input && HEADLESS_TESTS=$(headless) pytest  --ds=grady.settings $(path); git checkout core/templates/index.html
-
-teste2e-nc:
-	cp frontend/dist/index.html ./core/templates && python util/format_index.py && python manage.py collectstatic --no-input && HEADLESS_TESTS=$(headless) pytest --ds=grady.settings $(path); git checkout core/templates/index.html
+frontend/dist: $(shell find frontend/src -type f)
+	yarn --cwd frontend build
 
+teste2e: frontend/dist
+	set -e
+	cp frontend/dist/index.html core/templates
+	trap "git checkout core/templates/index.html" EXIT
+	python util/format_index.py
+	python manage.py collectstatic --no-input
+	HEADLESS_TESTS=$(headless) pytest  --ds=grady.settings $(path)
 
 coverage:
+	set -e
 	DJANGO_SETTINGS_MODULE=grady.settings pytest --cov
 	coverage html