Add in CI check step

Author: znichollscr

.github/workflows/ci.yaml

@@ -53,6 +53,23 @@ jobs:
           mkdocs build --strict
           (! git status --porcelain --untracked-files=no | grep '^.M') || (echo 'Docs are not up to date. Please run `make docs` locally then commit and upload the results.' && exit 1)
 
+  check-source-id-landing-pages-up-to-date:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Check docs are up to date
+        run: |
+          which pip
+          pip install -r requirements-docs.txt
+          python docs/source-id-landing-pages/auto-generate-source-id-pages.py
+          (! git status --porcelain --untracked-files=no | grep '^.M') || (echo 'Source ID landing pages are not up to date. Please run `make update-source-id-pages` locally then commit and upload the results.' && exit 1)
+
   cvs-load-with-input4mips-validation:
     runs-on: ubuntu-latest
     # Ok if this fails, we just want to use it as a warning for us to update input4MIPs-validation