adding common tools to docker

Author: Mzack9999

Dockerfile

@@ -3,6 +3,7 @@ RUN apk add --no-cache git
 RUN GO111MODULE=auto go get -u -v github.com/projectdiscovery/simplehttpserver/cmd/simplehttpserver
 
 FROM alpine:latest
+RUN apk add --no-cache bind-tools ca-certificates
 COPY --from=builder /go/bin/simplehttpserver /usr/local/bin/
 
 ENTRYPOINT ["simplehttpserver"]