chore: add CI workflow to include ruby-head (#260)

Author: ydah

.github/workflows/main.yml

@@ -20,6 +20,7 @@ jobs:
     strategy:
       matrix:
         ruby-version:
+          - 'ruby-head'
           - '3.4'
           - '3.3'
           - '3.2'
@@ -36,6 +37,12 @@ jobs:
           - 'gemfiles/sidekiq7_rails7.gemfile'
           - 'gemfiles/sidekiq8_rails8.gemfile'
         exclude:
+          - ruby-version: 'ruby-head'
+            gemfile: 'gemfiles/sidekiq5_rails6.gemfile'
+          - ruby-version: 'ruby-head'
+            gemfile: 'gemfiles/sidekiq6_4_rails6.gemfile'
+          - ruby-version: 'ruby-head'
+            gemfile: 'gemfiles/sidekiq6_5_rails6.gemfile'
           - ruby-version: '3.4'
             gemfile: 'gemfiles/sidekiq5_rails6.gemfile'
           - ruby-version: '3.4'