Add golangci-lint as base image

Dockerfile

-ARG GOLANG_VERSION=1.12-alpine
-
-FROM golang:$GOLANG_VERSION AS build
+FROM lab.wtfteam.pro:4567/containers/golangci-lint AS build
 
 LABEL maintainer="vladimir@hodakov.me"
 

README.md

 # Docker container with Go and pre-built tdlib
 
-This image is tagged by tdlib version. Each container have latest Go version at the time of build.
+This image is tagged by tdlib version. Each container have latest Go and golangci-lint version at the time of build.