switch to debian:buster slim and install make

.drone.yml

@@ -4,7 +4,7 @@ name: default
 
 steps:
 - name: make
-  image: docker:dind
+  image: debian:buster-slim
   environment:
     USERNAME:
       from_secret: docker_username
@@ -12,11 +12,17 @@ steps:
       from_secret: docker_password
     REGISTRY:
       from_secret: docker_registry
+    DOCKERVERSION: "19.03.9"
   volumes:
   - name: dockersock
     path: /var/run
   commands:
+  - apt-get update && apt install -y --no-install-recommends curl make ca-certificates git
+  - 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
   - sleep 5 # give docker enough time to start
+  - echo login $REGISTRY
   - docker login -u $USERNAME -p $PASSWORD $REGISTRY
   - make manifest-list
 - name: notify

Makefile

@@ -51,7 +51,7 @@ BASEIMAGE ?= scratch # gcr.io/distroless/static
 
 TAG := $(VERSION)__$(OS)_$(ARCH)
 
-BUILD_IMAGE ?= golang:1.14-alpine
+BUILD_IMAGE ?= golang:1.15.5-alpine
 
 BIN_EXTENSION :=
 ifeq ($(OS), windows)
@@ -137,7 +137,6 @@ 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 $$(pwd):/src                                         \
@@ -212,7 +211,8 @@ push: $(CONTAINER_DOTFILES)
 # TODO: Upstream was using manifest-tool and gcloud commands. Needs update
 manifest-list: # @HELP builds a manifest list of containers for all platforms
 manifest-list: all-container
-	@for bin in $(BINS); do                                                  \
+	@export DOCKER_CLI_EXPERIMENTAL=enabled  &&                              \
+	for bin in $(BINS); do                                                   \
 		docker manifest create $(REGISTRY)/$$bin:$(VERSION);                   \
 		for platform in $(ALL_PLATFORMS); do                                   \
 			docker manifest add --arch $$(echo $$platform | cut -d/ -f2)         \

build/build.sh

@@ -35,7 +35,7 @@ export CGO_ENABLED=0
 export GOARCH="${ARCH}"
 export GOOS="${OS}"
 export GO111MODULE=on
-export GOFLAGS="-mod=vendor"
+export GOFLAGS="-mod=mod"
 
 go install                                                            \
     -installsuffix "static"                                           \