Check formatting on GitHub Actions

.github/workflows/continuous-integration.yml

@@ -91,3 +91,10 @@ jobs:
       - run: python -m venv .venv
       - run: .venv/bin/pip install --requirement pylint-requirements.txt --requirement requirements.txt
       - run: .venv/bin/pylint --verbose src videojitter_test
+  black:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: python -m venv .venv
+      - run: .venv/bin/pip install --requirement black-requirements.txt
+      - run: .venv/bin/black --diff --check .

black-requirements.in

@@ -0,0 +1,2 @@
+# pip-tools `pip-compile` input file for pinning black.
+black

black-requirements.txt

@@ -0,0 +1,18 @@
+#
+# This file is autogenerated by pip-compile with Python 3.11
+# by the following command:
+#
+#    pip-compile --strip-extras black-requirements.in
+#
+black==23.11.0
+    # via -r black-requirements.in
+click==8.1.7
+    # via black
+mypy-extensions==1.0.0
+    # via black
+packaging==23.2
+    # via black
+pathspec==0.11.2
+    # via black
+platformdirs==4.0.0
+    # via black