pass LDflags to binary when building

Dockerfile

@@ -8,7 +8,7 @@ RUN apk --no-cache add build-base git
 COPY . ${GOPATH}/src/git.jonasfranz.software/JonasFranzDEV/gitea-github-migrator
 WORKDIR ${GOPATH}/src/git.jonasfranz.software/JonasFranzDEV/gitea-github-migrator
 
-RUN go build -o gitea-github-migrator
+RUN make docker-binary
 
 FROM alpine:3.7
 LABEL maintainer="info@jonasfranz.software"

Makefile

@@ -18,6 +18,10 @@ LDFLAGS := -X main.Version=$(VERSION) -X main.build=$(BUILD)
 .PHONY: all
 all:
 
+.PHONY: docker-binary
+docker-binary:
+	go build -ldflags "$(LDFLAGS)" -o gitea-github-migrator
+
 .PHONY: release
 release:
 	@hash gox > /dev/null 2>&1; if [ $$? -ne 0 ]; then \