add gh actions workflow

Author: woylie

.github/workflows/ci.yml

@@ -0,0 +1,79 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    name: OTP ${{matrix.otp}} / Elixir ${{matrix.elixir}}
+    strategy:
+      matrix:
+        otp: ["24.3", "25.1"]
+        elixir: ["1.13", "1.14"]
+        exclude:
+          - otp: "25.1"
+            elixir: "1.13"
+    env:
+      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+    services:
+      postgres:
+        image: postgres:12-alpine
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5432:5432
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: erlef/setup-beam@v1
+        with:
+          otp-version: ${{matrix.otp}}
+          elixir-version: ${{matrix.elixir}}
+      - name: Restore dependencies and build cache
+        uses: actions/cache@v3
+        with:
+          path: |
+            _build
+            deps
+          key: ${{ runner.os }}-otp-${{ steps.beam.outputs.otp-version }}-elixir-${{ steps.beam.outputs.elixir-version }}-mix-${{ hashFiles('mix.lock') }}
+          restore-keys: ${{ runner.os }}-otp-${{ steps.beam.outputs.otp-version }}-elixir-${{ steps.beam.outputs.elixir-version }}-
+      - name: Restore PLT cache
+        uses: actions/cache@v3
+        id: plt_cache
+        with:
+          key: |
+            ${{ runner.os }}-${{ steps.beam.outputs.otp-version }}-${{ steps.beam.outputs.elixir-version }}-plt-${{ hashFiles('mix.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-${{ steps.beam.outputs.otp-version }}-${{ steps.beam.outputs.elixir-version }}-plt-
+          path: |
+            .plts
+      - name: Install Dependencies
+        run: |
+          mix local.rebar --force
+          mix local.hex --force
+          mix deps.get
+      - name: Run Formatter
+        run: mix format --check-formatted
+      - name: Compile
+        run: mix compile --warnings-as-errors
+      # - name: Run Linter
+      #   run: mix credo
+      - name: Run Hex Audit
+        run: mix hex.audit
+      - name: Generate docs
+        run: mix docs
+      - name: Run Tests
+        run: mix coveralls.github