chore: add github actions workflow to automate the release process

Author: hellobertrand

.github/workflows/release.yml

@@ -0,0 +1,14 @@
+name: Release PHP SDK
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: google-github-actions/release-please-action@v4
+        with:
+          release-type: php