Prep for jupyter releaser (#1877)

.github/workflows/check-release.yml

@@ -0,0 +1,19 @@
+name: Check Release
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["*"]
+
+jobs:
+  check_release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+      - run: pip install -e .
+      - uses: jupyter-server/jupyter_releaser/.github/actions/check-release@v2
+        with:
+          version_spec: 10.10.10
+          token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/tests.yml

@@ -156,6 +156,7 @@ jobs:
           pip check
       - name: Run the tests
         run: |
+          export NBFORMAT_VALIDATOR=jsonschema
           pytest -vv -W default || pytest -vv -W default --lf
 
   make_sdist:

.gitignore

@@ -7,6 +7,7 @@ docs/source/api/generated
 docs/source/config/options
 docs/source/interactive/magics-generated.txt
 docs/gh-pages
+docs/source/CHANGELOG.md
 nbconvert/resources/style.min.css
 nbconvert/tests/files/*.html
 *.py[co]