Merge pull request #13988 from xlson/removes_old_ci

build: removes unused.

scripts/build/Dockerfile

-FROM centos:6.6
-
-RUN yum install -y yum-plugin-ovl initscripts curl tar gcc libc6-dev git gcc-c++ openssl-devel && \
-    yum install -y g++ make automake autoconf curl-devel zlib-devel httpd-devel apr-devel apr-util-devel sqlite-devel && \
-    yum install -y wget yum-utils bzip2 bzip2-devel && \
-    yum install -y fontconfig freetype freetype-devel fontconfig-devel libstdc++ && \
-    yum install -y rpm-build patch readline readline-devel libtool bison lzma && \
-    yum install -y which tar
-
-# Install RUBY 1.9.3
-# install necessary utilities
-# RUN yum install -y which tar
-RUN gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 && \
-    curl -sSl https://raw.githubusercontent.com/rvm/rvm/master/binscripts/rvm-installer | bash -s stable && \
-    source /etc/profile.d/rvm.sh && \
-    /bin/bash -l -c "rvm requirements" && \
-    /bin/bash -l -c "rvm install 2.1.9" && \
-    /bin/bash -l -c "rvm use 2.1.9 --default"
-
-# install nodejs
-RUN curl --silent --location https://rpm.nodesource.com/setup_6.x | bash - && \
-    yum install -y nodejs --nogpgcheck
-
-ENV GOLANG_VERSION 1.11
-
-RUN wget https://dl.yarnpkg.com/rpm/yarn.repo -O /etc/yum.repos.d/yarn.repo && \
-    yum install -y yarn --nogpgcheck && \
-    wget https://storage.googleapis.com/golang/go${GOLANG_VERSION}.linux-amd64.tar.gz && \
-    tar -C /usr/local -xzf go${GOLANG_VERSION}.linux-amd64.tar.gz
-
-
-ENV PATH /usr/local/go/bin:$PATH
-
-RUN mkdir -p /go/src /go/bin && chmod -R 777 /go
-
-ENV GOPATH /go
-ENV PATH /go/bin:$PATH
-
-ADD ./build.sh /tmp/
-
-WORKDIR /tmp/
-
-CMD ["./build.sh"]

scripts/build/build_container.sh

-#!/bin/bash
-
-docker info && docker version
-mkdir -p ~/docker
-
-echo "Circle branch: ${CIRCLE_BRANCH}"
-echo "Circle tag: ${CIRCLE_TAG}"
-
-# try to load docker container from cache
-if [[ -e ~/docker/centos.tar ]]; then
-  docker load -i ~/docker/centos.tar;
-else
-  docker build --rm=false --tag "grafana/buildcontainer" ./scripts/build/
-
-  # save docker container so we don't have to recreate it next run
-  docker save grafana/buildcontainer > ~/docker/centos.tar;
-fi