switch to debian:buster slim and install make

.drone.yml

@@ -17,7 +17,7 @@ steps:
   - name: dockersock
     path: /var/run
   commands:
-  - apt-get update && apt install -y --no-install-recommends curl make ca-certificates git
+  - apt-get update && apt install -y --no-install-recommends curl make ca-certificates
   - curl -fsSLO https://download.docker.com/linux/static/stable/x86_64/docker-$${DOCKERVERSION}.tgz
   - tar xzvf docker-$${DOCKERVERSION}.tgz --strip 1 -C /usr/local/bin docker/docker
   - rm docker-$${DOCKERVERSION}.tgz

Makefile

@@ -137,6 +137,7 @@ go-build: $(BUILD_DIRS)
 	@mkdir -p "$$(pwd)/.go/bin/$(OS)_$(ARCH)"
 	@chmod $(BINDIRMODE) "$$(pwd)/.go/bin/$(OS)_$(ARCH)"
 	@docker run                                                 \
+	    -i                                                      \
 	    --rm                                                    \
 	    -u $$(id -u):$$(id -g)                                  \
 	    -v $$(pwd):/src                                         \