limit rails/rubies combinaison

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
       fail-fast: false
       fail-fast: false
       matrix:
       matrix:
         ruby:
         ruby:
-          - 3.0
+          # - 3.0 # incompatible with rubysl
           - 2.7
           - 2.7
           - 2.6
           - 2.6
           - 2.5
           - 2.5
@@ -35,6 +35,20 @@ jobs:
           ruby: 2.6
           ruby: 2.6
         - rails: 'edge'
         - rails: 'edge'
           ruby: 2.5
           ruby: 2.5
+        - rails: '~> 7.0.0.alpha2'
+          ruby: 2.6
+        - rails: '~> 7.0.0.alpha2'
+          ruby: 2.5
+        # Legacy Rails with newer rubies
+        - rails: '~> 4.2.0'
+          ruby: 2.7
+        - rails: '~> 5.0.0'
+          ruby: 2.7
+        - rails: '~> 4.2.0'
+          ruby: 3.0
+        - rails: '~> 5.0.0'
+          ruby: 3.0
+
     env:
     env:
       RAILS: ${{ matrix.rails }}
       RAILS: ${{ matrix.rails }}
     steps:
     steps: