Update latexdiff.yml

using a pre-built TeX Live Docker image to avoid reinstalling texlive-full every run

.github/workflows/latexdiff.yml

@@ -1,4 +1,4 @@
-name: Generate LaTeX Diff with flatex
+name: LaTeX Diff
 
 on:
   workflow_dispatch:
@@ -15,6 +15,9 @@ on:
 jobs:
   latexdiff:
     runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/xu-cheng/texlive-full:latest
+      options: --user root  # allow package install if needed
 
     steps:
       - name: Checkout base branch
@@ -29,24 +32,23 @@ jobs:
           ref: ${{ github.event.inputs.compare_branch }}
           path: compare
 
-      - name: Install TeX Live and flatex
+      - name: Install flatex (Python flattener)
         run: |
-          sudo apt-get update
-          sudo apt-get install -y texlive-full
+          apk add --no-cache py3-pip  # if Alpine base
           pip install flatex
 
-      - name: Create output directory
+      - name: Create output folder
         run: mkdir -p diff_output
 
-      - name: Flatten base/main.tex
+      - name: Flatten base branch
         run: |
           flatex base/latex/main.tex > diff_output/base_flat.tex
 
-      - name: Flatten compare/main.tex
+      - name: Flatten compare branch
         run: |
           flatex compare/latex/main.tex > diff_output/compare_flat.tex
 
-      - name: Generate diff.tex
+      - name: Generate diff.tex using latexdiff
         run: |
           latexdiff diff_output/base_flat.tex diff_output/compare_flat.tex > diff_output/diff.tex
 
@@ -56,7 +58,7 @@ jobs:
           xelatex -interaction=nonstopmode diff.tex
           xelatex -interaction=nonstopmode diff.tex
 
-      - name: Upload all diff artifacts
+      - name: Upload diff output files
         uses: actions/upload-artifact@v4
         with:
           name: latex-diff-output