[ruby/rack-sequel] Let Puma decide the number of workers (#10121)

frameworks/Ruby/rack-sequel/Gemfile

@@ -3,6 +3,7 @@ source 'https://rubygems.org'
 gem 'json', '~> 2.8'
 gem 'sequel', '~> 5.0'
 gem 'rack', '~> 3.1'
+gem "concurrent-ruby"
 
 group :mysql, optional: true do
   gem 'trilogy', '~> 2.9', platforms: [:ruby, :windows]

frameworks/Ruby/rack-sequel/Gemfile.lock

@@ -2,6 +2,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     bigdecimal (3.1.9)
+    concurrent-ruby (1.3.5)
     json (2.13.2)
     nio4r (2.7.4)
     pg (1.5.9)
@@ -21,6 +22,7 @@ PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
+  concurrent-ruby
   json (~> 2.8)
   pg (~> 1.5)
   puma (~> 7.0)

frameworks/Ruby/rack-sequel/config/mri_puma.rb

@@ -1,9 +1,8 @@
 require_relative 'auto_tune'
 
 # FWBM only... use the puma_auto_tune gem in production!
-num_workers, num_threads = auto_tune
+_, num_threads = auto_tune
 
-workers num_workers
 threads num_threads, num_threads
 
 before_fork do

frameworks/Ruby/rack-sequel/rack-sequel-postgres.dockerfile

@@ -16,6 +16,7 @@ RUN bundle install --jobs=4 --gemfile=/rack-sequel/Gemfile
 
 ENV DBTYPE=postgresql
 
+ENV WEB_CONCURRENCY=auto
 EXPOSE 8080
 
 CMD bundle exec puma -C config/mri_puma.rb -b tcp://0.0.0.0:8080 -e production

frameworks/Ruby/rack-sequel/rack-sequel.dockerfile

@@ -16,6 +16,7 @@ RUN bundle install --jobs=4 --gemfile=/rack-sequel/Gemfile
 
 ENV DBTYPE=mysql
 
+ENV WEB_CONCURRENCY=auto
 EXPOSE 8080
 
 CMD bundle exec puma -C config/mri_puma.rb -b tcp://0.0.0.0:8080 -e production