[ci] Pin the ocurrent repository while waiting for a new release

.github/workflows/ci.yml

@@ -0,0 +1,64 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  schedule:
+    # Prime the caches every Monday
+    - cron: 0 1 * * MON
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Build and test
+
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - macos-latest
+          - ubuntu-latest
+        ocaml-compiler:
+          - "5.2.0"
+
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v4
+
+      - name: Use OCaml ${{ matrix.ocaml-compiler }}
+        uses: ocaml/setup-ocaml@v3
+        with:
+          ocaml-compiler: ${{ matrix.ocaml-compiler }}
+          dune-cache: ${{ matrix.os != 'macos-latest' }}
+          opam-disable-sandboxing: true
+
+      - name: Install system dependencies (Linux)
+        run: sudo apt update && sudo apt-get install libev-dev libonig-dev libcurl4-openssl-dev
+        if: runner.os == 'Linux'
+
+      - name: Install system dependencies (macOS)
+        run: brew update && brew reinstall libev openssl@3 # Openssl is a workaround for https://github.com/ocaml/opam-repository/issues/19676
+        if: runner.os == 'macOS'
+
+      - name: Pin occurrent to its master branch
+        run: opam pin add -y https://github.com/ocurrent/ocurrent.git#master
+
+      - name: Install opam dependencies
+        run: opam install --deps-only --with-test .
+
+      - name: Install ocamlformat
+        run: opam install ocamlformat.0.26.2
+
+      - name: Build project
+        run: opam exec -- dune build @install
+
+      - name: Run tests
+        run: opam exec -- make test
+
+      - name: Format code
+        run: opam exec -- dune build --auto-promote @fmt
+        if: runner.os == 'Linux'