Use Makefile to generate requirements

Makefile

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+# Note: run this file from within your virtualenv!
+#
+#
+# Build dependencies
+build:
+	pip-compile --output-file=requirements/base.txt pyproject.toml
+
+	# testing
+	pip-compile \
+		--extra=testing \
+		--output-file=requirements/testing.txt \
+		requirements/base.txt \
+		pyproject.toml
+
+	# development
+	pip-compile \
+		--extra=testing \
+		--extra=development \
+		--output-file=requirements/development.txt \
+		requirements/base.txt \
+		requirements/testing.txt \
+		pyproject.toml
+
+	# ci
+	pip-compile \
+		--extra=testing \
+		--extra=ci \
+		--output-file=requirements/ci.txt \
+		requirements/base.txt \
+		requirements/testing.txt \
+		pyproject.toml
+
+	# production
+	pip-compile \
+		--output-file=requirements/production.txt \
+		requirements/base.txt \
+		pyproject.toml