Add a non-linux simple CI workflow

.github/workflows/simple.yml

@@ -0,0 +1,58 @@
+# Simple CI for non-linux setups
+name: Simple
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  native:
+    name: "Simple: GHC ${{ matrix.ghc }} on ${{ matrix.os }}"
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [macos-latest, windows-latest]
+        ghc: ['9.2.8']
+      fail-fast: false
+    timeout-minutes:
+      60
+    steps:
+      - name: Set git to use LF
+        run: |
+          git config --global core.autocrlf false
+          git config --global core.eol lf
+
+      - name: Set up Haskell
+        id: setup-haskell
+        uses: haskell-actions/setup@v2
+        with:
+          ghc-version: ${{ matrix.ghc }}
+          cabal-version: '3.10.2.0'
+
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Cache
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.setup-haskell.outputs.cabal-store }}
+          key: ${{ runner.os }}-${{ matrix.ghc }}-${{ github.sha }}
+          restore-keys: ${{ runner.os }}-${{ matrix.ghc }}-
+
+      - name: cabal.project
+        run: cp cabal.project.ci cabal.project
+
+      - name: ghc-pkg dump
+        run: ghc-pkg list
+
+      - name: Dependencies
+        run: cabal build all --enable-tests --only-dependencies
+
+      - name: Build
+        run: cabal build all --enable-tests
+
+      - name: Test
+        run: cabal test all --enable-tests --test-show-details=direct