Allow to run docker from Makefile in non-interactive mode

Author: Mehonoshin

Makefile

@@ -31,8 +31,9 @@ TRAEFIK_ENVS := \
 
 TRAEFIK_MOUNT := -v "$(CURDIR)/$(BIND_DIR):/go/src/github.com/containous/traefik/$(BIND_DIR)"
 DOCKER_RUN_OPTS := $(TRAEFIK_ENVS) $(TRAEFIK_MOUNT) "$(TRAEFIK_DEV_IMAGE)"
-DOCKER_RUN_TRAEFIK := docker run $(INTEGRATION_OPTS) -it $(DOCKER_RUN_OPTS)
-DOCKER_RUN_TRAEFIK_NOTTY := docker run $(INTEGRATION_OPTS) -i $(DOCKER_RUN_OPTS)
+DOCKER_NON_INTERACTIVE ?= false
+DOCKER_RUN_TRAEFIK := docker run $(INTEGRATION_OPTS) $(if $(DOCKER_NON_INTERACTIVE), , -it) $(DOCKER_RUN_OPTS)
+DOCKER_RUN_TRAEFIK_NOTTY := docker run $(INTEGRATION_OPTS) $(if $(DOCKER_NON_INTERACTIVE), , -i) $(DOCKER_RUN_OPTS)
 
 PRE_TARGET ?= build-dev-image
 

docs/content/contributing/building-testing.md

@@ -16,6 +16,8 @@ For changes to its dependencies, the `dep` dependency management tool is require
 Run make with the `binary` target.
 This will create binaries for the Linux platform in the `dist` folder.
 
+In case when you run build on CI, you may probably want to run docker in non-interactive mode. To achieve that define `DOCKER_NON_INTERACTIVE=true` environment variable.
+
 ```bash
 $ make binary
 docker build -t traefik-webui -f webui/Dockerfile webui