Move to GitHub CI (#1266)

* Initial version of ci.yml

This is a straight copy from Dmitrii Kovanikov's blog post
at https://kodimensional.dev/github-actions.

Will adapt to haddock in successive commits.

* Delete .travis.yml

* Modify to only test on ghc-8.10.{1,2}

* Use actions/setup-haskell@v1.1.4

* Relax QuickCheck bound on haddock-api

* Remove stack matrix for now

* Nail down to ghc-8.10 branch for now

* Pin index state to 2020-12-08T20:13:44Z for now

* Disable macOS and Windows tests for now for speed up

Author: alexbiehl

.github/workflows/ci.yml

@@ -0,0 +1,49 @@
+name: CI
+
+# Trigger the workflow on push or pull request, but only for the master branch
+on:
+  pull_request:
+  push:
+    branches: ["ghc-8.10"]
+
+jobs:
+  cabal:
+    name: ${{ matrix.os }} / ghc ${{ matrix.ghc }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        cabal: ["3.2"]
+        ghc:
+          - "8.10.1"
+          - "8.10.2"
+
+    steps:
+    - uses: actions/checkout@v2
+      if: github.event.action == 'opened' || github.event.action == 'synchronize' || github.event.ref == 'refs/heads/ghc-8.10'
+
+    - uses: actions/setup-haskell@v1.1.4
+      id: setup-haskell-cabal
+      name: Setup Haskell
+      with:
+        ghc-version: ${{ matrix.ghc }}
+        cabal-version: ${{ matrix.cabal }}
+
+    - name: Freeze
+      run: |
+        cabal freeze
+
+    - uses: actions/cache@v1
+      name: Cache ~/.cabal/store
+      with:
+        path: ${{ steps.setup-haskell-cabal.outputs.cabal-store }}
+        key: ${{ runner.os }}-${{ matrix.ghc }}-${{ hashFiles('cabal.project.freeze') }}
+
+    - name: Build
+      run: |
+        cabal configure --enable-tests --enable-benchmarks --test-show-details=direct
+        cabal build all
+
+    - name: Test
+      run: |
+        cabal test all

.travis.yml

@@ -2,3 +2,6 @@ packages: ./
           ./haddock-api
           ./haddock-library
           ./haddock-test
+
+-- Pinning the index-state helps to make reasonably CI deterministic
+index-state: 2020-12-08T20:13:44Z

cabal.project

@@ -177,7 +177,7 @@ test-suite spec
                , haddock-library ^>= 1.9.0
                , xhtml           ^>= 3000.2.2
                , hspec           >= 2.4.4 && < 2.8
-               , QuickCheck      >= 2.11  && < 2.14
+               , QuickCheck      >= 2.11  && ^>= 2.14
 
   -- Versions for the dependencies below are transitively pinned by
   -- the non-reinstallable `ghc` package and hence need no version