codeowner (#2)

Author: ideaMarcos

.github/CODEOWNERS

@@ -0,0 +1,2 @@
+# I am the solo maintainer. All community PRs require my review.
+* @ideamarcos

.github/workflows/test.yml

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+name: Test
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+jobs:
+  main:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - pair:
+              elixir: 1.13.0
+              otp: 24.0
+            lint: true
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: erlef/setup-beam@v1
+        with:
+          otp-version: ${{matrix.pair.otp}}
+          elixir-version: ${{matrix.pair.elixir}}
+
+      - uses: actions/cache@v3
+        with:
+          path: |
+            deps
+            _build
+          key: ${{ runner.os }}-mix-${{matrix.pair.elixir}}-${{matrix.pair.otp}}-${{ hashFiles('**/mix.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-mix-
+
+      - run: mix deps.get
+
+      - run: mix format --check-formatted
+        if: ${{ matrix.lint }}
+
+      - run: mix deps.unlock --check-unused
+        if: ${{ matrix.lint }}
+
+      - run: mix deps.compile
+
+      - run: mix compile --warnings-as-errors
+        if: ${{ matrix.lint }}