Exclude uncompatible jobs

Author: edwinans

.github/workflows/workflow.yml

@@ -19,6 +19,9 @@ jobs:
           - 4.10.x
           - 4.09.x
           - 4.08.x
+        exclude:
+          - os: macos-latest
+            ocaml-compiler: [4.11.x, 4.09.x, 4.08.x]
 
     runs-on: ${{ matrix.os }}
 
@@ -42,7 +45,7 @@ jobs:
 
       - run: opam exec -- dune build -p landmarks @runtest
         continue-on-error: ${{ runner.os == 'Windows' }}
-        
+
       - run: opam install --deps-only --with-doc --with-test -y landmarks-ppx
 
       - run: opam exec -- dune build -p landmarks-ppx