Unify how we build dagfactory (#353)

Previously, when releasing DAG Factory, we would use `hatch build`.
However, we would use the `build` Python package to build for running
`make docker-run`.

This PR unifies so we always use `hatch build`, removing the `build`
dependency.

Makefile

@@ -1,12 +1,10 @@
-PYTHON=venv/bin/python3
-
 .PHONY: help
 help:
 	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
 
 .PHONY: setup
 setup: ## Setup development environment
-	python3 -m venv venv
+	python -m venv venv
 	. venv/bin/activate && pip --no-cache-dir install ".[tests]"
 	@echo "To activate the virtual environment, run:"
 	@echo "source venv/bin/activate"
@@ -22,10 +20,10 @@ clean: ## Removes build and test artifacts
 
 
 .PHONY: build-whl
-build-whl: setup ## Build installable whl file
-	cd dev
-	rm -rf  dev/include/*
-	python3 -m build --outdir dev/include/
+build-whl: ## Build installable whl file
+	rm -rf dev/include/*
+	hatch build
+	cp dist/* dev/include/
 
 .PHONY: docker-run
 docker-run: build-whl ## Runs local Airflow for testing

pyproject.toml

@@ -40,7 +40,6 @@ dependencies = [
 [project.optional-dependencies]
 tests = [
     "apache-airflow-providers-slack",
-    "build",
     "pytest>=6.0",
     "pytest-cov",
     "pre-commit",
@@ -52,7 +51,6 @@ tests = [
 
 [tool.hatch.envs.tests]
 dependencies = [
-    "build",
     "dag-factory[tests]",
     "apache-airflow~={matrix:airflow}.0,!=2.9.0,!=2.9.1",  # https://github.com/apache/airflow/pull/39670
     "httpx>=0.25.0",