Add basic github haskell CI

.github/workflows/haskell.yaml

@@ -0,0 +1,57 @@
+name: Haskell CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - uses: haskell-actions/setup@v2
+      with:
+        ghc-version: 9.4.7
+        cabal-version: latest
+
+    - name: Cache
+      uses: actions/cache@v3
+      env:
+        cache-name: cache-cabal
+      with:
+        path: ~/.cabal
+        key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/*.cabal') }}-${{ hashFiles('**/cabal.project') }}
+        restore-keys: |
+          ${{ runner.os }}-build-${{ env.cache-name }}-
+          ${{ runner.os }}-build-
+          ${{ runner.os }}-
+
+    - name: Install dependencies
+      run: |
+        cabal update
+        cabal \
+          --only-dependencies \
+          --enable-tests \
+          --enable-benchmarks \
+          --enable-optimization=1 \
+          build
+    - name: Build
+      run: |
+        cabal build \
+          --enable-tests \
+          --enable-benchmarks \
+          --enable-optimization=1 \
+          all
+    - name: Run tests
+      run: |
+        cabal test \
+          --enable-optimization=1 \
+          all
+