ci: install pandoc in the docs ci

Author: aminya

.github/workflows/docs.yml

@@ -25,6 +25,12 @@ jobs:
           task: true
           doxygen: true
 
+      - name: Setup pandoc
+        run: |
+          wget https://github.com/jgm/pandoc/releases/download/3.1.2/pandoc-3.1.2-1-amd64.deb
+          sudo dpkg -i pandoc-3.1.2-1-amd64.deb
+          rm pandoc-3.1.2-1-amd64.deb
+
       - name: Build Documentation
         run: task docs