missing quote

Dockerfile

@@ -4,7 +4,7 @@ ARG version
 WORKDIR /app
 COPY . .
 ENV GO111MODULE=auto
-RUN GOOS=linux CGO_ENABLED=1 go build -ldflags="-s -X 'main.version=$version" -o netmaker main.go
+RUN GOOS=linux CGO_ENABLED=1 go build -ldflags="-s -X 'main.version=$version'" -o netmaker main.go
 
 FROM alpine:3.13.6
 # add a c lib