Add CI job which simply cabal test

.github/workflows/ci-tests.yml

@@ -0,0 +1,37 @@
+name: ci-tests
+on:
+  push:
+    branches:
+      - master
+  pull_request: {} # Validate all PRs
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: true
+      matrix:
+        os: [ubuntu-latest]
+        ghc: ['9.10']
+    steps:
+    - uses: actions/checkout@v4
+    - uses: haskell-actions/setup@v2
+      id: setup-haskell-cabal
+      with:
+        ghc-version: ${{ matrix.ghc }}
+    - name: Update cabal package database
+      run: cabal update
+    - uses: actions/cache@v3
+      name: Cache cabal stuff
+      with:
+        path: |
+          ${{ steps.setup-haskell-cabal.outputs.cabal-store }}
+          dist-newstyle
+        key: ${{ runner.os }}-${{ matrix.ghc }}
+    - name: Test
+      run: |
+        cabal test --enable-tests --enable-benchmarks --test-show-details=direct all