feat: add CI and Codecov badges to README and set up Codecov integration

Author: devin-ai-integration[bot]

.github/workflows/build.yml

@@ -44,7 +44,7 @@ jobs:
           set -eux
           python -m pip install .[test]
 
-          pytest -vv -r ap --cov jupyterlab_deepnote
+          pytest -vv -r ap --cov jupyterlab_deepnote --cov-report=xml
           jupyter server extension list
           jupyter server extension list 2>&1 | grep -ie "jupyterlab_deepnote.*OK"
 
@@ -54,6 +54,14 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Upload coverage to Codecov
+        if: ${{ success() && (github.event_name != 'pull_request' || !github.event.pull_request.head.repo.fork) }}
+        uses: codecov/codecov-action@5a1091511ad55cbe89839c7260b706298ca349f7
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: ./coverage.xml
+          fail_ci_if_error: true
+
       - name: Package the extension
         run: |
           set -eux

README.md

@@ -1,5 +1,8 @@
 # jupyterlab_deepnote
 
+[![CI](https://github.com/deepnote/jupyterlab-deepnote/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/deepnote/jupyterlab-deepnote/actions/workflows/ci.yml)
+[![codecov](https://codecov.io/gh/deepnote/jupyterlab-deepnote/branch/main/graph/badge.svg)](https://codecov.io/gh/deepnote/jupyterlab-deepnote)
+
 A Deepnote extension for JupyterLab
 
 This extension is composed of a Python package named `jupyterlab_deepnote`