CI: Build Alchemy main branch (8.0a)

Author: tvdeyen

.github/workflows/ci.yml

@@ -13,6 +13,7 @@ jobs:
           - "7.2-stable"
           - "7.3-stable"
           - "7.4-stable"
+          - "main"
         ruby:
           - "3.2"
           - "3.3"
@@ -33,6 +34,10 @@ jobs:
             ruby: "3.4"
           - alchemy_branch: "7.2-stable"
             ruby: "3.4"
+          - alchemy_branch: "main"
+            ruby: "3.2"
+          - alchemy_branch: "main"
+            rails: "7.1"
           - rails: "7.1"
             ruby: "3.4"