[ANN] Set up OCaml 1.1.6

This release includes a change to make the OCaml CI workflow on Windows faster!

I tested this on one of my repos where the build itself is mere seconds. Before this change, setup-ocaml needed an average of 5:39 to install OCaml+opam and 1:53 to build the dependencies of the library. After this change, it needs an average of 3:15 for the installation and 1:27 for the deps.


  • Windows installs Cygwin to D:\cygwin, using faster Azure temporary storage.