Add CI runner (#5)

Reviewed-on: #5
Co-authored-by: Igor Ranieri <igor@elland.me>
Co-committed-by: Igor Ranieri <igor@elland.me>

.forgejo/workflows/test.yaml

@@ -0,0 +1,99 @@
+name: Haskell CI
+on:
+  pull_request:
+    branches:
+      - dev
+      - main
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: docker
+    container:
+      image: elland/haddock2:latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Check versions
+        run: |
+          ghc --version
+          cabal --version
+          node --version
+      - name: Cache Cabal packages
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cabal/packages
+            ~/.cabal/store
+            dist-newstyle
+          key: ${{ runner.os }}-haskell-9.10-cabal-${{ hashFiles('**/*.cabal', '**/cabal.project') }}
+          restore-keys: |
+            ${{ runner.os }}-haskell-9.10-cabal-
+      - name: Update Cabal package index
+        run: cabal update
+      - name: Configure project
+        run: cabal configure --enable-tests --enable-benchmarks
+      - name: Build dependencies
+        run: cabal build --only-dependencies --enable-tests --enable-benchmarks
+      - name: Build project
+        run: cabal build --enable-tests --enable-benchmarks
+      - name: Run documentation build
+        run: cabal haddock
+
+  test:
+    runs-on: docker
+    container:
+      image: elland/haddock2:latest
+    needs: build
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Cache Cabal packages
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cabal/packages
+            ~/.cabal/store
+            dist-newstyle
+          key: ${{ runner.os }}-haskell-9.10-cabal-${{ hashFiles('**/*.cabal', '**/cabal.project') }}
+          restore-keys: |
+            ${{ runner.os }}-haskell-9.10-cabal-
+      - name: Update Cabal package index
+        run: cabal update
+      - name: Configure project
+        run: cabal configure --enable-tests --enable-benchmarks
+      - name: Build dependencies
+        run: cabal build --only-dependencies --enable-tests --enable-benchmarks
+      - name: Build project
+        run: cabal build --enable-tests --enable-benchmarks
+      - name: Run tests
+        run: cabal test --test-show-details=direct
+
+  fourmolu:
+    runs-on: docker
+    container:
+      image: elland/haddock2:latest
+    needs: build
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Run fourmolu
+        run: |
+          find src test app -name "*.hs" -exec fourmolu --check-idempotence {} \; 2>/dev/null || true
+          find src test app -name "*.hs" -exec fourmolu --mode check {} \;
+
+  hlint:
+    runs-on: docker
+    container:
+      image: elland/haddock2:latest
+    needs: build
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Run hlint
+        run: |
+          if [ -d src ]; then hlint src/; fi
+          if [ -d test ]; then hlint test/; fi  
+          if [ -d app ]; then hlint app/; fi