Merge pull request #112 from mboersma/build-no-cache

feat(Makefile): set docker build flags via environment variable

Author: mboersma

.travis.yml

@@ -6,6 +6,8 @@ branches:
     - master
 services:
   - docker
+env:
+  - DOCKER_BUILD_FLAGS="--pull --no-cache"
 sudo: required
 install:
   - pip install -r rootfs/dev_requirements.txt

Makefile

@@ -6,7 +6,7 @@ include versioning.mk
 
 # For cases where we're building from local
 docker-build:
-	docker build --rm -t ${IMAGE} rootfs
+	docker build ${DOCKER_BUILD_FLAGS} -t ${IMAGE} rootfs
 	docker tag ${IMAGE} ${MUTABLE_IMAGE}
 
 setup-venv: