Add CI

.github/workflows/ci.yml

@@ -0,0 +1,38 @@
+name: ci
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: ['*']
+
+jobs:
+  build:
+    runs-on: ubuntu-18.04
+    strategy:
+      matrix:
+        os: [ubuntu-18.04, macos-10.15]
+        ghc: ["8.6", "8,8", "8.10", "9.0"]
+        cabal: ["3.2"]
+
+    steps:
+    - uses: actions/checkout@v2
+    - uses: haskell/actions/setup@v1
+      with:
+        ghc-version: ${{ matrix.ghc }}
+
+    - name: Cache cabal stuff
+      uses: actions/cache@v2
+      with:
+        path: |
+          ${{ steps.setup-haskell-cabal.outputs.cabal-store }}
+          dist-newstyle
+        key: ${{ runner.os }}-${{ matrix.ghc }}
+
+    - run: cabal update 
+
+    - name: Build & Test webauthn
+      run: |
+        cabal build
+        cabal test
+        cabal haddock