try to add unit tests and xmllint step

Author: hjwp

.github/workflows/tests.yml

@@ -135,3 +135,36 @@ jobs:
             *.css
 
 
+  other-tests:
+    runs-on: ubuntu-latest
+    strategy:
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install apt stuff and other dependencies
+        shell: bash
+        run: |
+          sudo apt update -y
+          sudo apt install -y \
+            asciidoctor \
+            language-pack-en \
+            ruby-coderay \
+            ruby-pygments.rb \
+            tree \
+            xmllint
+          pip install uv
+
+      - name: Install Python requirements.txt into virtualenv
+        shell: bash
+        run: |
+          make .venv/bin
+
+      - name: Run unit tests
+        shell: bash
+        run: |
+          make unit-test
+
+      - name: Run xml linter
+        shell: bash
+        run: |
+          make xmllint_book