ci: set up with release please v4 and stub publish step

.github/workflows/on-push-to-main-branch.yml

@@ -10,7 +10,7 @@ jobs:
 
     steps:
       - name: Setup repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           token: ${{ secrets.MOMENTO_MACHINE_USER_GITHUB_TOKEN }}
 
@@ -24,3 +24,42 @@ jobs:
           dev_docs_slug: python
           template_file: ./README.template.md
           output_file: ./README.md
+
+  release-please:
+    needs: [build]
+    runs-on: ubuntu-24.04
+    outputs:
+      release_created: ${{ steps.release.outputs.release_created }}
+      tag_name: ${{ steps.release.outputs.tag_name }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: googleapis/release-please-action@v4
+        name: Release Please
+        id: release
+        with:
+          token: ${{ secrets.MOMENTO_MACHINE_USER_GITHUB_TOKEN }}
+          release-type: python
+
+  publish-python:
+    needs: [release-please]
+    if: ${{ needs.release-please.outputs.release_created == 'true' }}
+    runs-on: ubuntu-24.04
+    env:
+      VERSION: ${{ needs.release-please.outputs.tag_name }}
+
+    steps:
+      - name: Setup repo
+        uses: actions/checkout@v4
+
+      - name: Publish package
+        run: |
+          set -e
+          set -x
+          if [ -z "$VERSION" ]
+          then
+            echo "Unable to determine SDK version!  Exiting!"
+            exit 1
+          fi
+          echo "Going to publish version=$VERSION"

.release-please-manifest.json

@@ -0,0 +1,20 @@
+{
+  "changelog-sections": [
+    {
+      "type": "feat",
+      "section": "Features",
+      "hidden": false
+    },
+    {
+      "type": "fix",
+      "section": "Bug Fixes",
+      "hidden": false
+    },
+    {
+      "type": "chore",
+      "section": "Miscellaneous",
+      "hidden": false
+    }
+  ],
+  "extra-files": ["src/momento/__init__.py"],
+}

src/momento/__init__.py

@@ -18,6 +18,8 @@
 from .topic_client import TopicClient
 from .topic_client_async import TopicClientAsync
 
+__version__ = "0.0.0"  # x-release-please-version
+
 logging.getLogger("momentosdk").addHandler(logging.NullHandler())
 logs.initialize_momento_logging()
 
@@ -31,4 +33,5 @@
     "TopicClientAsync",
     "AuthClient",
     "AuthClientAsync",
+    "__version__",
 ]