diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
new file mode 100644
index 0000000..873a5c0
--- /dev/null
+++ b/.gitea/workflows/ci.yml
@@ -0,0 +1,43 @@
+# Continuous integration for the Quiz Game.
+#
+# Run by Gitea Actions. The file lives in .gitea/workflows, not .github/workflows:
+# GitHub refuses pushes that touch .github/workflows from a token without the
+# workflow scope, and that stopped the push mirror to GitHub. Runs the same
+# checks as the README, "Run the tests".
+name: CI
+
+on:
+  push:
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  checks:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out the repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python 3.13
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+
+      - name: Install the development tools
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install --group dev
+
+      - name: Lint
+        run: ruff check src tests
+
+      - name: Check formatting
+        run: ruff format --check src tests
+
+      - name: Check types
+        run: mypy --strict src tests
+
+      - name: Run the tests
+        run: python -m pytest
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
deleted file mode 100644
index bc06723..0000000
--- a/.github/workflows/ci.yml
+++ /dev/null
@@ -1,44 +0,0 @@
-name: CI
-
-# Read by GitHub Actions and by Gitea Actions. No step opens a turtle window:
-# the tests use a recording fake pen.
-
-on:
-  push:
-    branches: [main]
-  pull_request:
-
-jobs:
-  checks:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Check out the repository
-        uses: actions/checkout@v4
-
-      - name: Set up Python 3.13
-        uses: actions/setup-python@v5
-        with:
-          python-version: "3.13"
-
-      - name: Install Doxygen
-        run: sudo apt-get update && sudo apt-get install --yes doxygen
-
-      - name: Install the project and its development tools
-        run: |
-          python -m pip install --upgrade pip
-          python -m pip install -e ".[dev]"
-
-      - name: Lint
-        run: ruff check .
-
-      - name: Check formatting
-        run: ruff format --check .
-
-      - name: Check types
-        run: mypy
-
-      - name: Run the tests
-        run: python -m pytest
-
-      - name: Build the source documentation
-        run: doxygen Doxyfile