CI

.github/workflows/haskell.yml

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+name: Haskell CI
+
+on:
+  # Trigger the workflow on push or pull request,
+  # but only for the master branch
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  build:
+    name: ghc ${{ matrix.ghc }}
+    runs-on: ubuntu-16.04
+    strategy:
+      matrix:
+        ghc: ["8.8.1"]
+        cabal: ["3.0"]
+
+    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 }}
+
+    # We cache the elements of the Cabal store separately,
+    # as the entirety of ~/.cabal can grow very large
+    # for projects with many dependencies.
+
+    - uses: actions/cache@v1
+      name: Cache ~/.cabal/packages
+      with:
+        path: ~/.cabal/packages
+        key: ${{ runner.os }}-${{ matrix.ghc }}-cabal-packages
+    - uses: actions/cache@v1
+      name: Cache ~/.cabal/store
+      with:
+        path: ~/.cabal/store
+        key: ${{ runner.os }}-${{ matrix.ghc }}-cabal-store
+    - uses: actions/cache@v1
+      name: Cache dist-newstyle
+      with:
+        path: dist-newstyle
+        key: ${{ runner.os }}-${{ matrix.ghc }}-dist-newstyle
+
+    - name: Install sdl2
+      run: |
+        sudo apt-get install libsdl2-dev
+
+    - name: Install dependencies
+      run: |
+        cabal v2-update
+        cabal v2-configure --enable-tests --enable-documentation --write-ghc-environment-files=always
+        cabal v2-build --only-dependencies
+    - name: Build & test
+      run: |
+        cabal v2-build
+        echo 'No tests'