fixup! TO-DROP: ci: restrict to win+Meson

It should work now. Let's exercise that, and at the same time also debug
the `documentation` bug.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

.github/workflows/main.yml

@@ -42,3 +42,15 @@ jobs:
       with:
         name: windows-meson-artifacts
         path: build
+  documentation:
+    name: documentation
+    concurrency:
+      group: documentation-${{ github.ref }}
+    env:
+      jobname: Documentation
+      CI_JOB_IMAGE: ubuntu-latest
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v5
+    - run: ci/install-dependencies.sh
+    - run: ci/test-documentation.sh