Add a simple Drone build file to test and build

.drone.yml

@@ -0,0 +1,10 @@
+workspace:
+  base: /app
+  path: .
+
+pipeline:
+  build:
+    image: python:3
+    commands:
+      - make test
+      - make build

Makefile

@@ -11,7 +11,7 @@ test: env
 	./env/bin/tox
 
 .PHONY: build
-build: test
+build: env
 	./env/bin/python setup.py sdist
 	./env/bin/python setup.py bdist_wheel