Update Dockerfile

Author: lmangani

Dockerfile

@@ -3,6 +3,7 @@ FROM golang:alpine as builder
 RUN apk update && apk add --no-cache git build-base
 RUN git clone https://github.com/ivlovric/HFP /HFP
 WORKDIR /HFP
+RUN go mod tidy
 RUN go build -ldflags "-s -w" -o HFP *.go
 
 FROM alpine:latest