ci: Add workflow for publishing client package

Add a GitHub Actions workflow to automatically publish the client Python
package to PyPI when changes to its source code are committed, given
that the tests have completed successfully. The workflow uses poetry for
building and publishing the package.

Signed-off-by: Phoevos Kalemkeris <[email protected]>

Author: phoevos

.github/workflows/publish-client.yml

@@ -0,0 +1,28 @@
+name: Publish Python Client to PyPI
+
+on:
+  workflow_run:
+    workflows:
+      - "Python tests"
+    types:
+      - completed
+    paths:
+      - "client/**"
+  workflow_dispatch:
+
+jobs:
+  build-and-publish:
+    runs-on: ubuntu-latest
+    if: |
+      github.event_name == "workflow_dispatch" ||
+      github.event.workflow_run.conclusion == "success"
+    defaults:
+      run:
+        working-directory: client
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Build and publish to pypi
+        uses: JRubics/[email protected]
+        with:
+          pypi_token: ${{ secrets.PYPI_API_TOKEN }}