Make lunar lander fail in CI due to not installing swig (#366)

## Description

<!-- Provide a brief description of the PR's purpose here. -->

The lunar lander tutorial and example were both working in the CI even
though we had not installed swig. It turns out that swig is installed in
the GitHub Actions container by default (see
actions/runner-images#1203), which means that
box2d could install properly without running `pip install swig`. This PR
removes swig during the installation for tutorials and examples, so that
the lunar lander tutorial will fail properly. The issue will be fixed in
a followup PR.

## TODO

<!-- Notable points that this PR has either accomplished or will
accomplish. -->

- [x] Remove swig in tutorial CI (tutorials will still work since the
lunar lander tutorial installs swig)
- [x] Remove swig in example CI

## Questions

<!-- Any concerns or points of confusion? -->

## Status

- [x] I have read the guidelines in

[CONTRIBUTING.md](https://github.com/icaros-usc/pyribs/blob/master/CONTRIBUTING.md)
- [x] I have formatted my code using `yapf`
- [x] I have tested my code by running `pytest`
- [x] I have linted my code with `pylint`
- [x] I have added a one-line description of my change to the changelog
in
      `HISTORY.md`
- [x] This PR is ready to go

.github/workflows/testing.yml

@@ -114,6 +114,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      # SWIG should not be installed so that we can test that lunar lander is
+      # installing SWIG properly. See https://github.com/icaros-usc/pyribs/pull/366
+      - name: Remove swig
+        run: sudo rm -rf /usr/bin/swig
       - name: Set up Python 3.8
         uses: actions/setup-python@v4
         with:
@@ -129,6 +133,10 @@ jobs:
     steps:
       # We use Python 3.10 instead of 3.8 here since Google Colab uses 3.10.
       - uses: actions/checkout@v4
+      # SWIG should not be installed so that we can test that lunar lander is
+      # installing SWIG properly. See https://github.com/icaros-usc/pyribs/pull/366
+      - name: Remove swig
+        run: sudo rm -rf /usr/bin/swig
       - name: Set up Python 3.10
         uses: actions/setup-python@v4
         with:

HISTORY.md

@@ -20,6 +20,7 @@
 
 - Use dask instead of multiprocessing for lunar lander tutorial ({pr}`346`)
 - pip install swig before gymnasium[box2d] in lunar lander tutorial ({pr}`346`)
+- Fix lunar lander dependency issues ({pr}`366`)
 
 #### Improvements