CI: partial revert 1782, restore wasm ci (#1789)

.gitattributes

@@ -3,3 +3,7 @@
 
 *.ml linguist-language=OCaml
 *.mli linguist-language=OCaml
+
+# We are pinning wasm_of_ocaml using this file in the CI. This would
+# fail on Windows otherwise.
+VERSION -text

.github/workflows/build-wasm_of_ocaml.yml

@@ -35,8 +35,17 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
+      - name: Set git to use LF
+        if: ${{ matrix.os == 'windows-latest' && matrix.ocaml-compiler < 5.2 }}
+        run: |
+          git config --global core.autocrlf false
+          git config --global core.eol lf
+          git config --global core.ignorecase false
+
       - name: Checkout tree
         uses: actions/checkout@v4
+        with:
+          path: wasm_of_ocaml
 
       - name: Checkout Jane Street opam repository
         uses: actions/checkout@v4
@@ -64,20 +73,28 @@ jobs:
         # It's faster to use a cached version
         run: opam install --fake binaryen-bin
 
+      - name: Pin wasm_of_ocaml
+        working-directory: ./wasm_of_ocaml
+        run: opam pin -n --with-version `< VERSION` .
+
       - name: Checkout Jane Street packages
         run: |
           opam install opam-format ocamlfind dune graphics cmdliner sexplib0.v0.16.0
-          opam exec -- ocaml tools/ci_setup.ml
+          opam exec -- ocaml wasm_of_ocaml/tools/ci_setup.ml
 
-      - name: Install dependencies
-        run: opam install . --deps-only --with-test
+      - name: Install wasm_of_ocaml and its test dependencies
+        working-directory: ./wasm_of_ocaml
+        run: |
+          opam install `basename -s .opam *.opam` num cohttp-lwt-unix ppx_expect cstruct
 
       - name: Run tests
         if: ${{ matrix.separate_compilation }}
+        working-directory: ./wasm_of_ocaml
         run: opam exec -- dune build @runtest-wasm
 
       - name: Run tests with CPS effects
         if: ${{ matrix.ocaml-compiler >= '5.' && matrix.separate_compilation }}
+        working-directory: ./wasm_of_ocaml
         run: opam exec -- dune build @runtest-wasm --profile with-effects
 
       - name: Run Base tests