install pandoc and asciidoctor on github workflow.

Author: jmorat

.github/workflows/kapture-main.yml

@@ -26,11 +26,16 @@ jobs:
         cache: pip
         cache-dependency-path: pyproject.toml
 
-    - name: Install dependencies
+    - name: Install system dependencies
       run: |
-        python -m pip install --upgrade pip
-        pip install flake8 pytest
-        make install
+        sudo apt-get update
+        sudo apt-get install -y pandoc asciidoctor
+
+    - name: Install python dependencies
+      run: |
+          python -m pip install --upgrade pip
+          python -m pip install flake8 pytest
+          make install
 
     - name: Lint with flake8
       run: |