dockerfile update

Dockerfile

@@ -1,7 +1,30 @@
-FROM golang:latest 
-RUN mkdir -p /app
-WORKDIR /app 
-ADD main.go /app
-RUN go get -u
-RUN go build ./main.go 
-CMD ["./main"]
+############################
+# STEP 1 build executable binary
+############################
+FROM golang:alpine AS builder
+
+# Install git.
+# Git is required for fetching the dependencies.
+RUN apk update && apk add --no-cache git
+
+WORKDIR $GOPATH/src/git.cliffbreak.de/Cliffbreak/tsviewer
+COPY . .
+
+# Fetch dependencies.
+
+# Using go get.
+RUN go get -d -v
+
+# Build the binary.
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -installsuffix cgo -ldflags="-w -s" -o /go/bin/main
+
+############################
+# STEP 2 build a small image
+############################
+FROM scratch
+
+# Copy our static executable.
+COPY --from=builder /go/bin/main /go/bin/main
+
+# Run the hello binary.
+ENTRYPOINT ["/go/bin/main"]