ci: add GitHub Actions deployment workflow

.github/workflows/ci.yml

@@ -0,0 +1,29 @@
+name: Publish Elixir Package to Hex
+
+on:
+  push:
+    branches:
+      - master # Trigger only on pushes to the master branch
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout Code
+      uses: actions/checkout@v4
+
+    - name: Set up Elixir
+      uses: actions/checkout@v3
+
+
+    - name: Install Dependencies
+      run: mix deps.get
+
+    - name: Publish to Hex
+      env:
+        HEX_API_KEY: ${{ secrets.HEX_API_KEY }}
+      run: |
+        mix hex.publish --yes
+
+