feat(GHA): add github actions (#1)

.github/workflows/elixir.yml

@@ -0,0 +1,44 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: Elixir CI
+
+on:
+  push:
+    branches: ["master"]
+  pull_request:
+    branches: ["master"]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        elixir: ["1.15.4", "1.14.5"]
+        otp: ["26.0.2", "25.3.2", "24.3.4"]
+
+    name: Build and test
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Elixir
+        uses: erlef/setup-beam@61e01a43a562a89bfc54c7f9a378ff67b03e4a21 # v1.16.0
+        with:
+          elixir-version: ${{ matrix.elixir }}
+          otp-version: ${{ matrix.otp }}
+      - name: Restore dependencies cache
+        uses: actions/cache@v3
+        with:
+          path: deps
+          key: ${{ runner.os }}-mix-${{ matrix.elixir }}-${{ matrix.otp }}-${{ hashFiles('**/mix.lock') }}
+          restore-keys: ${{ runner.os }}-mix-
+
+      - name: Install dependencies
+        run: mix deps.get
+      - name: Run tests
+        run: mix test

.gitignore

@@ -21,3 +21,5 @@ erl_crash.dump
 
 # Elixir code analyzer results
 .elixir_ls
+
+.tool-versions