[CI] Move ruby 3.0 from matrix to include

excluding Rails edge that stopped supporting Ruby 3.0

.github/workflows/main.yml

@@ -11,11 +11,27 @@ jobs:
     name: Ruby ${{ matrix.ruby_version }} / Rails ${{ matrix.rails_version }}${{ matrix.api == '1' && ' / API' || '' }}
     strategy:
       matrix:
-        ruby_version: [ruby-head, '3.2', '3.1', '3.0']
+        ruby_version: [ruby-head, '3.2', '3.1']
         rails_version: [edge, '7.1', '7.0', '6.1']
         api: ['0', '1']
 
         include:
+          - ruby_version: '3.0'
+            rails_version: '7.1'
+          - ruby_version: '3.0'
+            rails_version: '7.1'
+            api: '1'
+          - ruby_version: '3.0'
+            rails_version: '7.0'
+          - ruby_version: '3.0'
+            rails_version: '7.0'
+            api: '1'
+          - ruby_version: '3.0'
+            rails_version: '6.1'
+          - ruby_version: '3.0'
+            rails_version: '6.1'
+            api: '1'
+
           - ruby_version: '2.7'
             rails_version: '7.1'
           - ruby_version: '2.7'