Update go to 1.12 and refactor cmd tool code.

.dockerignore

@@ -19,7 +19,6 @@ _cgo_export.*
 
 _testmain.go
 
-workreportmgr
 *.exe
 *.test
 

.gitignore

@@ -19,6 +19,5 @@ _cgo_export.*
 
 _testmain.go
 
-workreportmgr
 *.exe
 *.test

Dockerfile

@@ -1,27 +1,35 @@
-FROM golang:1.8-alpine
+FROM golang:1.12-alpine
 
-ARG GO_ROOT_IMPORT_PATH=github.com/icedream/workreport-manager
-
-COPY . "/go/src/${GO_ROOT_IMPORT_PATH}"
 RUN \
 	apk add --no-cache --virtual .build-deps \
 		git \
-		libc-dev \
-		&&\
-	git config --global http.followRedirects true &&\
-	mkdir -p /go &&\
-	export GOPATH=/go &&\
-	export PATH="${PATH}:${GOPATH}/bin" &&\
+		libc-dev
+
+# Git configuration
+RUN git config --global http.followRedirects true
+
+# Install tools which will be used by go generate
+RUN \
 	go get -v \
 		github.com/jteeuwen/go-bindata/... \
-		golang.org/x/tools/cmd/goimports &&\
-	export CGO_ENABLED=0 &&\
-	go get -v -d "${GO_ROOT_IMPORT_PATH}/..." &&\
-	(cd "${GOPATH}/src/${GO_ROOT_IMPORT_PATH}" &&\
-		go generate -v ./...) &&\
-	go build -v -a -installsuffix cgo \
-		-o /usr/local/bin/workreportmgr "${GO_ROOT_IMPORT_PATH}" &&\
-	apk del .build-deps &&\
-	rm -rf "${GOPATH}"
+		golang.org/x/tools/cmd/goimports
+
+# Copy app source, fetch dependencies and build all binaries
+WORKDIR /usr/src/app
+COPY . .
+RUN go generate -v ./...
+RUN \
+	CGO_ENABLED=0 \
+	GOBIN="/usr/local/bin" \
+	go install -v -a -installsuffix cgo ./cmd/...
+
+RUN ls -lAh /usr/local/bin
+
+###
+
+FROM alpine
+
+# Copy built binaries into this image
+COPY --from=0 /usr/local/bin/ /usr/local/bin/
 
 ENTRYPOINT ["workreportmgr"]