Add daily CI workflow (#15)

* Rename test workflow

* Test more Elixir/OTP combos

* Add daily CI workflow

.github/workflows/ci.yml

@@ -0,0 +1,35 @@
+name: CI
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ubuntu-20.04
+    env:
+      MIX_ENV: test
+    strategy:
+      fail-fast: true
+      # https://hexdocs.pm/elixir/1.14.0/compatibility-and-deprecations.html#compatibility-between-elixir-and-erlang-otp
+      matrix:
+        include:
+          - elixir: 1.15
+            otp: 24.x
+          - elixir: 1.15
+            otp: 25.x
+          - elixir: 1.15
+            otp: 26.x
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: erlef/setup-beam@v1
+        with:
+          otp-version: ${{matrix.otp}}
+          elixir-version: ${{matrix.elixir}}
+      - run: mix deps.unlock --all
+      - run: mix deps.get
+      - run: mix deps.compile
+      - run: mix compile --warnings-as-errors
+      - run: mix test

.github/workflows/elixir.yml → .github/workflows/test.yml

@@ -1,4 +1,4 @@
-name: CI
+name: Test
 
 on:
   pull_request:
@@ -47,6 +47,13 @@ jobs:
           - elixir: 1.14
             otp: 25.x
 
+          - elixir: 1.15
+            otp: 24.x
+          - elixir: 1.15
+            otp: 25.x
+          - elixir: 1.15
+            otp: 26.x
+
     steps:
       - uses: actions/checkout@v2
       - uses: erlef/setup-beam@v1