Update workflows

Add a new workflow to publish the odoc documentation of `master` branch
and compile `ocplib-simplex` with both `OCaml` 4.08.1 and 5.0.0.

.github/workflows/build.yml

@@ -7,7 +7,7 @@ on:
 permissions: {}
 
 env:
-  OCAML_DEFAULT_VERSION: 4.10.1
+  OCAML_DEFAULT_VERSION: 4.08.1
   # Add OPAMYES=true to the environment, this is usefill to replace `-y` option
   # in any opam call
   OPAMYES: true
@@ -21,19 +21,21 @@ jobs:
           - macos-latest
           - ubuntu-latest
         ocaml-compiler:
-          - 4.10.1
+          - 4.08.1
+          - 5.0.0
 
     runs-on: ${{ matrix.os }}
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           persist-credentials: true
 
       - name: Use OCaml ${{ matrix.ocaml-compiler }}
         uses: ocaml/setup-ocaml@v2
         with:
+          allow-prerelease-opam: true
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
           dune-cache: true
 
@@ -45,5 +47,3 @@ jobs:
 
       - name: Run tests
         run: opam exec -- make test
-
-

.github/workflows/documentation.yml

@@ -0,0 +1,40 @@
+name: Documentation
+
+on:
+  push:
+    branches:
+      - master
+
+env:
+  OCAML_DEFAULT_VERSION: 5.0.0
+  OPAMYES: true
+
+jobs:
+  odoc:
+    name: Odoc documentation
+    runs-on: ubuntu-latest
+    env:
+      OPAMWITHDOC: true
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Use OCaml ${{ env.OCAML_DEFAULT_VERSION }}
+        uses: ocaml/setup-ocaml@v2
+        with:
+          allow-prerelease-opam: true
+          ocaml-compiler: ${{ env.OCAML_DEFAULT_VERSION }}
+          dune-cache: true
+
+      - name: Install dependencies
+        run: opam install . --deps-only --with-doc
+
+      - name: Make odoc documentation
+        run: opam exec -- make doc
+
+      - name: Upload documentation
+        uses: actions/upload-artifact@v4
+        with:
+          name: odoc
+          path: _build/default/_doc/_html/