Dockerfile improvements

Author: joanlopez

Dockerfile

@@ -6,10 +6,10 @@ RUN apk add --update git
 WORKDIR /go/src/github.com/friendsofgo/graphiql
 COPY . .
 RUN TAG=$(git describe --tags --abbrev=0) \
-    && LDFLAGS=$(echo "-s -X main.version="$TAG) \
-    && go build -o /go/bin/graphiql -ldflags "$LDFLAGS" cmd/graphiql/main.go
+    && LDFLAGS=$(echo "-s -w -X main.version="$TAG) \
+    && CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -installsuffix cgo -o /go/bin/graphiql -ldflags "$LDFLAGS" cmd/graphiql/main.go
 
 # Building image with the binary
-FROM alpine
-COPY --from=build /go/bin/graphiql /bin/
-ENTRYPOINT ["graphiql"]
+FROM scratch
+COPY --from=build /go/bin/graphiql /go/bin/graphiql
+ENTRYPOINT ["/go/bin/graphiql"]