Try to add more tests in main.yml

Author: craff

.github/workflows/main.yml

@@ -14,7 +14,9 @@ jobs:
       matrix:
         os:
           - ubuntu-latest
-          # - windows-latest not available yet ?
+	  - fedora-43
+          - arm32
+	  - arm64
         ocaml-compiler:
           - "5.3"
           - "5.4"