fixup! CI/OCaml: load environment in GITHUB_ENV

Author: dannywillems

.github/actions/setup-ocaml/action.yml

@@ -17,4 +17,4 @@ runs:
       run: |
         # Export all OPAM environment variables to GITHUB_ENV
         # This avoids other steps to run `eval $(opam env)`
-        opam env | sed -E 's/; export [A-Za-z_][A-Za-z0-9_]*;?//g'
+        opam env | sed -E 's/; export [A-Za-z_][A-Za-z0-9_]*;?//g' >> $GITHUB_ENV