Add release-please for automated releases

.github/workflows/release-please.yml

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+name: Release Please
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    outputs:
+      release_created: ${{ steps.release.outputs.release_created }}
+      tag_name: ${{ steps.release.outputs.tag_name }}
+    steps:
+      - name: Generate token
+        id: generate-token
+        uses: actions/create-github-app-token@v1
+        with:
+          app-id: ${{ vars.SDK_BOT_APP_ID }}
+          private-key: ${{ secrets.SDK_BOT_PRIVATE_KEY }}
+
+      - uses: googleapis/release-please-action@v4
+        id: release
+        with:
+          token: ${{ steps.generate-token.outputs.token }}
+
+  publish:
+    name: Publish to Hex
+    needs: release-please
+    if: needs.release-please.outputs.release_created == 'true'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Elixir and Erlang
+        uses: erlef/setup-beam@5304e04ea2b355f03681464e683d92e3b2f18451 # v1.18.2
+        with:
+          elixir-version: '1.15'
+          otp-version: '26.0'
+
+      - name: Install dependencies
+        run: mix deps.get
+
+      - name: Publish to Hex
+        run: mix hex.publish --yes
+        env:
+          HEX_API_KEY: ${{ secrets.HEX_API_KEY }}

.release-please-manifest.json

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+{
+  ".": "1.1.4"
+}

release-please-config.json

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+{
+  "packages": {
+    ".": {
+      "release-type": "elixir",
+      "bump-minor-pre-major": true,
+      "bump-patch-for-minor-pre-major": true
+    }
+  },
+  "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json"
+}