fix(ci): latex caching improvements

Signed-off-by: skjnldsv <skjnldsv@protonmail.com>

Author: skjnldsv

.github/workflows/sphinxbuild.yml

@@ -66,33 +66,44 @@ jobs:
     - name: Install pip dependencies
       run: pip install -r requirements.txt
 
-    - name: Configure apt cache to use /tmp for caching LaTeX packages
+    - name: Configure apt cache
       if: ${{ matrix.manual.build_pdf_path }}
       run: |
         mkdir -p /tmp/apt/cache/archives
         echo 'Dir::Cache::archives "/tmp/apt/cache/archives";' | sudo tee /etc/apt/apt.conf.d/apt-cache-tmp
 
     - name: Cache LaTeX apt packages
       if: ${{ matrix.manual.build_pdf_path }}
+      id: cache-latex-apt
       uses: actions/cache@668228422ae6a00e4ad889ee87cd7109ec5666a7 # v5.0.4
       with:
         path: /tmp/apt/cache/archives
-        key: latex-apt-${{ runner.os }}-${{ hashFiles('.github/workflows/sphinxbuild.yml') }}
+        key: latex-apt-${{ runner.os }}-${{ runner.arch }}-ubuntu-24.04-texlive-2023
         restore-keys: |
-          latex-apt-${{ runner.os }}-
+          latex-apt-${{ runner.os }}-${{ runner.arch }}-ubuntu-24.04-
+          latex-apt-${{ runner.os }}-${{ runner.arch }}-
 
     - name: Install LaTeX dependencies
-      if: ${{ matrix.manual.build_pdf_path }}
+      if: ${{ matrix.manual.build_pdf_path && steps.cache-latex-apt.outputs.cache-hit != 'true' }}
       run: |
-        # Install required packages for PDF generation via LaTeX
         sudo DEBIAN_FRONTEND=noninteractive apt-get update
         sudo DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
           python3-pil python3-pip texlive-fonts-recommended latexmk \
           texlive-latex-extra texlive-latex-recommended texlive-xetex \
           texlive-fonts-extra-links texlive-fonts-extra xindy
 
-    - name: Fix apt cache ownership for caching
-      if: ${{ matrix.manual.build_pdf_path }}
+    - name: Install LaTeX from cache
+      if: ${{ matrix.manual.build_pdf_path && steps.cache-latex-apt.outputs.cache-hit == 'true' }}
+      run: |
+        sudo DEBIAN_FRONTEND=noninteractive apt-get update
+        sudo DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+          --no-download \
+          python3-pil python3-pip texlive-fonts-recommended latexmk \
+          texlive-latex-extra texlive-latex-recommended texlive-xetex \
+          texlive-fonts-extra-links texlive-fonts-extra xindy
+
+    - name: Fix apt cache ownership
+      if: ${{ matrix.manual.build_pdf_path && steps.cache-latex-apt.outputs.cache-hit != 'true' }}
       run: sudo chown -R $(id -u):$(id -g) /tmp/apt/cache/archives
 
     - name: Build html documentation