Change the default DOCKER_HOST to tcp://docker:2375 for drone builds

Author: calind

images/build/Dockerfile

@@ -177,8 +177,6 @@ RUN set -ex \
     && curl -sL -o /tini https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini-${ARCH} \
     && chmod +x /tini
 
-ENV DOCKER_HOST=unix:///workspace/docker.sock
-
 COPY root /
 
 ENTRYPOINT [ "/tini", "-g", "--", "/build/run.sh" ]

makelib/image.mk

@@ -31,7 +31,7 @@ IMAGE_TEMP_DIR := $(shell mktemp -d)
 endif
 
 ifeq ($(DRONE),true)
-DOCKER_HOST ?= unix:///workspace/docker.sock
+DOCKER_HOST ?= tcp://docker:2375
 export DOCKER_HOST
 endif