New target in Makefile, changed Dockerfile

Dockerfile

@@ -1,10 +1,11 @@
 FROM golang:1.14 AS builder
+ARG version=dev
 
 WORKDIR /app
 COPY go.mod go.sum /app/
 RUN go mod download
 COPY *go /app/
-RUN GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -tags netgo -o /sendmail ./...
+RUN GOOS=linux GOARCH=amd64 go build -ldflags="-w -s -X main.version=${version}" -tags netgo -o /sendmail ./...
 
 FROM busybox:latest AS shell
 

Makefile

@@ -17,6 +17,9 @@ clean:
 
 build: clean output/sendmail
 
+docker-build:
+	docker build --build-arg=version=$(VERSION) -t leophys/mailer:$(VERSION) .
+
 dev-build: clean output/sendmail-dev
 
 bumpvers-minor:
@@ -34,9 +37,11 @@ bumpvers-major:
 release-min:
 	make bumpvers-minor
 	make build
+	make docker-build
 
 release-maj:
 	make bumpvers-major
 	make build
+	make docker-build
 
-PHONY: bumpvers-minor bumpvers-major release-min release-maj clean
+PHONY: bumpvers-minor bumpvers-major release-min release-maj clean docker-build