ci: run "apt-get update" before installing packages (#7)

Author: pzhlkj6612

.github/workflows/publish.yml

@@ -22,6 +22,7 @@ jobs:
 
     - name: Install apt dependencies
       run: |
+        sudo apt-get update && \
         sudo apt-get install -y --no-install-recommends \
           dblatex \
           docbook-xml \