Build fixes

Dockerfile

@@ -1,13 +1,17 @@
 # Accept GOOS and GOARCH as build arguments
 ARG GOOS=linux
 ARG GOARCH=amd64
+ARG BuiltAt
+ARG GoVersion
+ARG GitCommit
+ARG Version
 
 # Build stage
 FROM golang:1-alpine AS builder
 WORKDIR /app
 COPY . .
 RUN apk add --no-cache bash git go gcc musl-dev curl fuse
-RUN go build -o zurg cmd/zurg/main.go
+RUN go build -ldflags="-s -w -X 'main.BuiltAt=${BuiltAt}' -X 'main.GoVersion=${GoVersion}' -X 'main.GitCommit=${GitCommit}' -X 'main.Version=${Version}'" -o zurg cmd/zurg/main.go
 
 # Obfuscation stage
 FROM alpine:3 AS obfuscator