Use Stack instead of Cabal for CI

.github/workflows/ci.yml

@@ -1,42 +1,33 @@
 name: CI
 
-# Trigger the workflow on push or pull request, but only for the master branch
 on:
-  pull_request:
   push:
-    branches: [master]
+    branches: [master, main]
 
 jobs:
   build:
-    name: ghc ${{ matrix.ghc }}
-    runs-on: ubuntu-16.04
-    strategy:
-      matrix:
-        cabal: ["2.4"]
-        ghc:
-          - "8.8.3"
-
+    runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v2
-      if: github.event.action == 'opened' || github.event.action == 'synchronize' || github.event.ref == 'refs/heads/master'
-
-    - uses: actions/setup-haskell@v1
-      name: Setup Haskell
-      with:
-        ghc-version: ${{ matrix.ghc }}
-        cabal-version: ${{ matrix.cabal }}
+      - name: Checkout
+        uses: actions/checkout@v3
 
-    - uses: actions/cache@v1
-      name: Cache ~/.cabal/store
-      with:
-        path: ~/.cabal/store
-        key: ${{ runner.os }}-${{ matrix.ghc }}-cabal
+      - name: Setup Stack
+        uses: haskell-actions/setup@v2
+        with:
+          enable-stack: true
+          stack-no-global: true
 
-    - name: Build
-      run: |
-        cabal v2-update
-        cabal v2-build --enable-tests --enable-benchmarks
+      - name: Cache Stack build files
+        uses: actions/cache@v2
+        with:
+          path: |
+            ~/.stack
+            .stack-work
+          key: >-
+            ${{ runner.os }}-stack-${{
+            hashFiles('stack.yaml.lock', 'package.yaml') }}
+          restore-keys: |
+            ${{runner.os}}-stack
 
-    - name: Test
-      run: |
-        cabal v2-test --enable-tests
+      - name: Test
+        run: stack test