GHA: simplify tests

Author: MisterDA

.github/workflows/build.yml

@@ -1,11 +1,10 @@
-name: build
+name: Builds, tests & co
 
 on:
-  pull_request:
-  push:
-  schedule:
-    # Prime the caches every Monday
-    - cron: 0 1 * * MON
+  - push
+  - pull_request
+
+permissions: read-all
 
 jobs:
   build:
@@ -14,83 +13,32 @@ jobs:
       matrix:
         os:
           - ubuntu-latest
-        packages:
-          - "."
-        runtest:
-          - true
+          - macos-latest
+          - windows-latest
         ocaml-compiler:
-          - "5.x"
-          - "4.14"
-        include:
-          - os: macos-latest
-            ocaml-compiler: "4.14"
-            packages: "."
-            runtest: true
-
-          - os: windows-latest
-            ocaml-compiler: "4.14"
-            packages: "alcotest alcotest-js alcotest-lwt alcotest-mirage"
-            opam-local-packages: "alcotest.opam alcotest-js.opam alcotest-lwt.opam alcotest-mirage.opam"
-            runtest: false
-
-          - os: ubuntu-latest
-            ocaml-compiler: "4.08"
-            packages: "alcotest alcotest-js alcotest-lwt alcotest-mirage"
-            opam-local-packages: "alcotest.opam alcotest-js.opam alcotest-lwt.opam alcotest-mirage.opam"
-            runtest: false
-
-          - os: ubuntu-latest
-            ocaml-compiler: "4.09"
-            packages: "alcotest alcotest-js alcotest-lwt alcotest-mirage"
-            opam-local-packages: "alcotest.opam alcotest-js.opam alcotest-lwt.opam alcotest-mirage.opam"
-            runtest: false
-
-          - os: ubuntu-latest
-            ocaml-compiler: "4.10"
-            packages: "alcotest alcotest-js alcotest-lwt alcotest-mirage"
-            opam-local-packages: "alcotest.opam alcotest-js.opam alcotest-lwt.opam alcotest-mirage.opam"
-            runtest: false
-
-          - os: ubuntu-latest
-            ocaml-compiler: "4.11"
-            packages: "alcotest alcotest-js alcotest-lwt alcotest-mirage"
-            opam-local-packages: "alcotest.opam alcotest-js.opam alcotest-lwt.opam alcotest-mirage.opam"
-            runtest: false
-
-          - os: ubuntu-latest
-            ocaml-compiler: "4.12"
-            packages: "alcotest alcotest-js alcotest-lwt alcotest-mirage"
-            opam-local-packages: "alcotest.opam alcotest-js.opam alcotest-lwt.opam alcotest-mirage.opam"
-            runtest: false
-
-          - os: ubuntu-latest
-            ocaml-compiler: "4.13"
-            packages: "alcotest alcotest-js alcotest-lwt alcotest-mirage"
-            opam-local-packages: "alcotest.opam alcotest-js.opam alcotest-lwt.opam alcotest-mirage.opam"
-            runtest: false
+          - 5
+          - 4.14
+          - 4.08
 
     runs-on: ${{ matrix.os }}
 
     steps:
-      - name: Set git to use LF
-        run: |
-          git config --global core.autocrlf false
-          git config --global core.eol lf
-
-      - name: Checkout code
+      - name: Checkout tree
         uses: actions/checkout@v4
 
       - name: Set-up Node.js
         uses: actions/setup-node@v4
         with:
           node-version: lts/*
 
-      - name: Set-up OCaml ${{ matrix.ocaml-compiler }}
+      - name: Set-up OCaml
         uses: ocaml/setup-ocaml@v3
         with:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
-          opam-local-packages: ${{ matrix.opam-local-packages }}
 
-      - run: opam install ${{ matrix.packages }} --with-test --deps-only
-      - if: ${{ matrix.runtest }}
-        run: opam exec -- dune build @install @check @runtest @runtest-js
+      - run: opam install . --deps-only --with-test
+
+      - run: opam exec -- dune build
+
+      - run: opam exec -- dune build @install @check @runtest @runtest-js
+        if: ${{ matrix.ocaml-compiler <> '4.08' }}