include ipykernel in nb dependencies

.devcontainer/postCreateCommands.sh

@@ -2,5 +2,4 @@ pip install --upgrade pip > /tmp/pip.stdout.log 2> /tmp/pip.stderr.log
 pip install uv > /tmp/uv.stdout.log 2> /tmp/uv.stderr.log
 uv tool install tox --with tox-uv > /tmp/tox.stdout.log 2> /tmp/tox.stderr.log
 uv venv --python 3.10 .venv > /tmp/venv.stdout.log 2> /tmp/venv.stderr.log
-.venv/bin/activate
-uv pip install -e . > /tmp/install.stdout.log 2> /tmp/install.stderr.log
+chmod +x .venv/bin/activate && .venv/bin/activate && uv pip install -e .[nb] > /tmp/install.stdout.log 2> /tmp/install.stderr.log

pyproject.toml

@@ -54,6 +54,7 @@ classifiers = [
 [project.optional-dependencies]
 dev = ["tox", "uv"]
 # docs = ["sphinx", "sphinx-rtd-theme"]
+nb = ["ipykernel"]
 
 [project.urls]
 Homepage = "https://example.com"