drone ci config, releases go binary on github

.drone.yml

@@ -0,0 +1,38 @@
+---
+kind: pipeline
+type: docker
+name: Build and publish
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: Build
+  image: golang
+  commands:
+    - make build
+
+- name: Create release files
+  image: golang
+  commands:
+    - make release
+  when:
+    event: tag
+
+- name: Upload release files
+  image: plugins/github-release
+  settings:
+    api_key:
+      from_secret: GHCR_UPLOAD_TOKEN
+    files: release/*
+    checksum:
+      - sha512
+    draft: true
+  when:
+    event: tag
+---
+kind: signature
+hmac: e35934cf1ba5c663aec6e5cd3204912446cc3b98c7a05d85fbf20d0429577df2
+
+...

Makefile

@@ -2,19 +2,62 @@
 
 PROJECT_NAME=$(shell basename $(CURDIR))
 
+APPLICATION_NAME := traefik-etcd-advertiser
+VERSION := $(shell git describe --tags HEAD 2>/dev/null || echo $(DRONE_TAG))
+# PLATFORMS := darwin/amd64 darwin/arm64 linux/amd64 linux/arm linux/arm64 windows/amd64
+PLATFORMS := darwin/arm64 linux/amd64
+
 ## build: build the application
-build:
+build: install
 	export GO111MODULE="auto"; \
-	go mod download; \
-	go mod vendor; \
-	CGO_ENABLED=0 go build -a -ldflags '-s' -installsuffix cgo -o main main.go
+		go mod download; \
+		go mod vendor; \
+		CGO_ENABLED=0 go build -a -ldflags '-s' -installsuffix cgo -o main main.go
+
+
+release: install-vendor
+	@for platform in $(PLATFORMS); do \
+		GOOS=$$(echo $$platform | cut -d'/' -f1); \
+		GOARCH=$$(echo $$platform | cut -d'/' -f2); \
+		os=$$GOOS; \
+		if [ "$$os" = "darwin" ]; then \
+			os="macOS"; \
+		fi; \
+		output_name="$(APPLICATION_NAME)-$(VERSION)-$$os-$$GOARCH"; \
+		if [ "$$os" = "windows" ]; then \
+			output_name+=".exe"; \
+		fi; \
+		echo "Building release/$$output_name..."; \
+		env GO11MODULE="auto" CGO_ENABLED=0 \
+			GOOS=$$GOOS GOARCH=$$GOARCH go build \
+			-ldflags "-w -s -X main.Version=$(VERSION)" \
+			-o release/$$output_name; \
+		if [ $$? -ne 0 ]; then \
+			echo 'An error has occurred! Aborting.'; \
+			exit 1; \
+		fi; \
+		cd release > /dev/null; \
+		if [ "$$os" = "windows" ]; then \
+			zip "$$output_name.zip" "$$output_name"; \
+			rm "$$output_name"; \
+		else \
+			chmod a+x "$$output_name"; \
+			tar -czf "$$output_name.tar" "$$output_name"; \
+			rm "$$output_name"; \
+		fi; \
+		cd ..; \
+	done
 
 ## install: fetches go modules
 install:
-	export GO111MODULE="on"; \
+	export go111module="on"; \
 	go mod tidy; \
 	go mod download \
 
+install-vendor: install
+	export go111module="on"; \
+	go mod vendor
+
 ## server: runs the server with -race
 server:
 	export GO111MODULE="on"; \