ci: Add github action

Author: ali-abrar

.github/workflows/haskell.yml

@@ -0,0 +1,45 @@
+name: github-action
+
+on: [push, pull_request] 
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        ghc: ['8.0.2', '8.2.2', '8.4.4', '8.6.5', '8.8.4', '8.10.2']
+        os: ['ubuntu-latest', 'macos-latest']
+        exclude:
+          # There are some linker warnings in 802 on darwin that
+          # cause compilation to fail
+          # See https://github.com/NixOS/nixpkgs/issues/25139
+          - ghc: '8.0.2'
+            os: 'macos-latest'
+    runs-on: ${{ matrix.os }}
+
+    name: GHC ${{ matrix.ghc }} on ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-haskell@v1
+      with:
+        ghc-version: ${{ matrix.ghc }}
+    - name: Cache
+      uses: actions/cache@v1
+      env:
+        cache-name: cache-cabal
+      with:
+        path: ~/.cabal
+        key: ${{ runner.os }}-${{ matrix.ghc }}-build-${{ env.cache-name }}-${{ hashFiles('**/*.cabal') }}-${{ hashFiles('**/cabal.project') }}
+        restore-keys: |
+          ${{ runner.os }}-${{ matrix.ghc }}-build-${{ env.cache-name }}-
+          ${{ runner.os }}-${{ matrix.ghc }}-build-
+          ${{ runner.os }}-${{ matrix.ghc }}-
+          ${{ runner.os }}
+
+    - name: Install dependencies
+      run: |
+        cabal update
+        cabal build --only-dependencies --enable-tests --enable-benchmarks
+    - name: Build
+      run: cabal build --enable-tests --enable-benchmarks all
+    - name: Run tests
+      run: cabal test all