Revert "Manylinux2010-based Ruby images"

This reverts commit bec51c0.

Rakefile

@@ -121,7 +121,6 @@ task 'gem:native' do
   verbose = ENV['V'] || '0'
 
   grpc_config = ENV['GRPC_CONFIG'] || 'opt'
-  ruby_cc_versions = '2.7.0:2.6.0:2.5.0:2.4.0:2.3.0'
 
   if RUBY_PLATFORM =~ /darwin/
     FileUtils.touch 'grpc_c.32.ruby'
@@ -131,28 +130,17 @@ task 'gem:native' do
         "invoked on macos with ruby #{RUBY_VERSION}. The ruby macos artifact " \
         "build should be running on ruby 2.5."
     end
-    system "rake cross native gem RUBY_CC_VERSION=#{ruby_cc_versions} V=#{verbose} GRPC_CONFIG=#{grpc_config}"
+    system "rake cross native gem RUBY_CC_VERSION=2.7.0:2.6.0:2.5.0:2.4.0:2.3.0 V=#{verbose} GRPC_CONFIG=#{grpc_config}"
   else
     Rake::Task['dlls'].execute
-    ['x86-mingw32', 'x64-mingw32'].each do |plat|
+    ['x86-mingw32', 'x64-mingw32', 'x86_64-linux', 'x86-linux'].each do |plat|
       run_rake_compiler plat, <<-EOT
         gem update --system --no-document && \
         bundle && \
         rake native:#{plat} pkg/#{spec.full_name}-#{plat}.gem pkg/#{spec.full_name}.gem \
-          RUBY_CC_VERSION=#{ruby_cc_versions} V=#{verbose} GRPC_CONFIG=#{grpc_config}
-      EOT
-    end
-    # Truncate grpc_c.*.ruby files because they're for Windows only.
-    File.truncate('grpc_c.32.ruby', 0)
-    File.truncate('grpc_c.64.ruby', 0)
-    ['x86_64-linux', 'x86-linux'].each do |plat|
-      run_rake_compiler plat,  <<-EOT
-        gem update --system --no-document && \
-        bundle && \
-        rake native:#{plat} pkg/#{spec.full_name}-#{plat}.gem pkg/#{spec.full_name}.gem \
-          RUBY_CC_VERSION=#{ruby_cc_versions} V=#{verbose} GRPC_CONFIG=#{grpc_config} &&
-        sudo chmod -R a+rw pkg &&
-        patchelf_gem.sh pkg/#{spec.full_name}-#{plat}.gem
+          RUBY_CC_VERSION=2.7.0:2.6.0:2.5.0:2.4.0:2.3.0 \
+          V=#{verbose} \
+          GRPC_CONFIG=#{grpc_config}
       EOT
     end
   end