feat(ci): Add Github Test Action

.github/workflows/mix-test.yml

@@ -0,0 +1,46 @@
+name: Elixir Mix Tests
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - '**'
+
+env:
+  MIX_ENV: test
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        otp: ['26.2.4']
+        elixir: ['1.16.2']
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Elixir
+        uses: actions/setup-elixir@v1
+        with:
+          elixir-version: ${{matrix.otp}}
+          otp-version: ${{matrix.elixir}}
+
+      - name: Install dependencies
+        run: mix deps.get
+
+      - name: Cache deps
+        id: cache-deps
+        uses: actions/cache@v4
+        env:
+          cache-name: cache-elixir-deps
+        with:
+          path: deps
+          key: ${{ runner.os }}-mix-${{ env.cache-name }}-${{ hashFiles('**/mix.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-mix-${{ env.cache-name }}-
+
+      - name: Run tests
+        run: mix test