Rakefile: remove GitLab configuration; close #5409

This CI could consume too much CPU time on GitLab. Maybe we should add
resource concious CI configuration on GitLab.

Rakefile

@@ -31,7 +31,6 @@ load "#{MRUBY_ROOT}/tasks/bin.rake"
 load "#{MRUBY_ROOT}/tasks/presym.rake"
 load "#{MRUBY_ROOT}/tasks/test.rake"
 load "#{MRUBY_ROOT}/tasks/benchmark.rake"
-load "#{MRUBY_ROOT}/tasks/gitlab.rake"
 load "#{MRUBY_ROOT}/tasks/doc.rake"
 
 ##############################

tasks/gitlab.rake

@@ -1,121 +0,0 @@
-CI_VERSION = '0.7'.freeze
-CI_BASE = 'ubuntu:16.10'.freeze
-CI_COMPILERS = ['gcc-4.7',
-                'gcc-4.8',
-                'gcc-4.9',
-                'gcc-5',
-                'gcc-6',
-                'clang-3.5',
-                'clang-3.6',
-                'clang-3.7',
-                'clang-3.8',
-                'clang-3.9'].freeze
-
-def ci_image_tag(compiler)
-  compiler.tr('+', 'c').delete('-').delete('.')
-end
-
-def ci_docker_tag(compiler)
-  tag = ci_image_tag(compiler)
-  "registry.gitlab.com/dabroz/mruby:#{tag}_#{CI_VERSION}"
-end
-
-def run_cmd(cmd)
-  puts cmd
-  raise 'error' unless system cmd
-end
-
-namespace :gitlab do
-  desc 'recreate docker images for GitLab builds'
-  task :dockers do
-    CI_COMPILERS.each do |compiler|
-      tag = ci_image_tag(compiler)
-      filename = "Dockerfile.#{tag}"
-      File.open(filename, 'wb') do |f|
-        f << "# #{compiler} - #{tag}\n"
-        f << "FROM #{CI_BASE}\n"
-        f << "RUN apt-get update && apt-get install -y git ruby2.3 ruby2.3-dev bison\n"
-        f << "RUN apt-get update && apt-get install -y binutils manpages\n"
-        f << "RUN apt-get update && apt-get install -y #{compiler}\n"
-        if compiler['gcc']
-          f << "RUN apt-get update && apt-get install -y libx32#{compiler}-dev\n"
-          f << "RUN apt-get update && apt-get install --no-install-recommends -y #{compiler}-multilib\n"
-        end
-        f << "RUN dpkg --add-architecture i386\n"
-        f << "RUN apt-get update && apt-get install -y linux-libc-dev:i386\n"
-        if compiler['clang']
-          f << "RUN apt-get update && apt-get install --no-install-recommends -y libc6-dev-i386\n"
-          f << "RUN apt-get update && apt-get install -y gcc gcc-multilib\n"
-        end
-      end
-      docker_tag = ci_docker_tag(compiler)
-      cmd1 = "docker build -t #{docker_tag} -f #{filename} ."
-      cmd2 = "docker push #{docker_tag}"
-      run_cmd cmd1
-      run_cmd cmd2
-      File.delete(filename)
-    end
-  end
-
-  desc 'create build configurations and update .gitlab-ci.yml'
-  task :config do
-    require 'yaml'
-
-    configs = []
-    [true, false].each do |mode_32|
-      ['', 'MRB_USE_FLOAT32'].each do |float_conf|
-        ['', 'MRB_NAN_BOXING', 'MRB_WORD_BOXING'].each do |boxing_conf|
-          ['', 'MRB_UTF8_STRING'].each do |utf8_conf|
-            next if (float_conf == 'MRB_USE_FLOAT32') && (boxing_conf == 'MRB_NAN_BOXING')
-            next if (int_conf == 'MRB_INT64') && (boxing_conf == 'MRB_NAN_BOXING')
-            next if (int_conf == 'MRB_INT64') && (boxing_conf == 'MRB_WORD_BOXING') && mode_32
-            env = [float_conf, int_conf, boxing_conf, utf8_conf].map do |conf|
-              conf == '' ? nil : "-D#{conf}=1"
-            end.compact.join(' ')
-            bit = mode_32 ? '-m32 ' : ''
-            _info = ''
-            _info += mode_32 ? '32bit ' : '64bit '
-            _info += float_conf['USE'] ? 'float ' : ''
-            _info += int_conf['16'] ? 'int16 ' : ''
-            _info += int_conf['64'] ? 'int64 ' : ''
-            _info += boxing_conf['NAN'] ? 'nan ' : ''
-            _info += boxing_conf['WORD'] ? 'word ' : ''
-            _info += utf8_conf['UTF8'] ? 'utf8 ' : ''
-            _info = _info.gsub(/ +/, ' ').strip.tr(' ', '_')
-            configs << { '_info' => _info, 'CFLAGS' => "#{bit}#{env}", 'LDFLAGS' => bit.strip.to_s }
-          end
-        end
-      end
-    end
-    path = './.gitlab-ci.yml'
-    data = YAML.load_file(path)
-    data.keys.select do |key|
-      key.start_with? 'Test'
-    end.each do |key|
-      data.delete(key)
-    end
-    CI_COMPILERS.each do |compiler|
-      configs.each do |config|
-        name = "Test #{compiler} #{config['_info']}"
-        hash = {
-          'CC' => compiler,
-          'CXX' => compiler.gsub('gcc', 'g++').gsub('clang', 'clang++'),
-          'LD' => compiler
-        }
-        hash = hash.merge(config)
-        hash.delete('_info')
-        data[name] = {
-          'stage' => 'test',
-          'image' => ci_docker_tag(compiler),
-          'variables' => hash,
-          'script' => 'env; rake --verbose all test'
-        }
-      end
-    end
-    File.open(path, 'w') { |f| YAML.dump(data, f) }
-  end
-end
-
-# deprecated
-task "gitlab_config" => "gitlab:config"
-task "gitlab_dockers" => "gitlab:dockers"