update build action to fix tlmgr bug + cron

.github/workflows/build.yml

@@ -1,6 +1,8 @@
 name: build
 
 on:
+  schedule:
+    - cron: '0 0 * * 0' 
   workflow_dispatch:
   push:
     branches: main
@@ -18,8 +20,14 @@ jobs:
         uses: quarto-dev/quarto-actions/setup@v2
         with:
           tinytex: true
-          version: pre-release
 
+      - name: register tinytex globally for diagram.lua
+        run: |
+          mkdir -p ~/.local/bin
+          ~/.TinyTeX/bin/x86_64-linux/tlmgr option sys_bin ~/.local/bin
+          ~/.TinyTeX/bin/x86_64-linux/tlmgr path add
+          ~/.TinyTeX/bin/x86_64-linux/tlmgr install libertinus-fonts
+  
       - name: Install Computo extension for Quarto
         run: |
             quarto add --no-prompt computorg/computo-quarto-extension