chore(ci): faster build

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

Author: skjnldsv

.github/workflows/sphinxbuild.yml

@@ -15,6 +15,8 @@ jobs:
 
     name: Build ${{ matrix.manual.name }}
     runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/nextcloud/continuous-integration-documentation:documentation-16
 
     strategy:
       matrix:
@@ -57,33 +59,15 @@ jobs:
 
     - name: Checkout repository
       uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-
-    - name: Install LaTeX dependencies
-      if: ${{ matrix.manual.build_pdf_path }}
-      run: |
-        sudo DEBIAN_FRONTEND=noninteractive apt-get update
-        sudo DEBIAN_FRONTEND=noninteractive apt-get install -y \
-          python3-pil \
-          python3-pip \
-          texlive-fonts-recommended \
-          latexmk \
-          texlive-latex-extra \
-          texlive-latex-recommended \
-          texlive-xetex \
-          texlive-fonts-extra-links \
-          texlive-fonts-extra \
-          xindy
-
-    - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
-      with:
-        python-version: '3.12'
-        cache: 'pip'
-
-    - name: Install pip dependencies
-      run: pip install -r requirements.txt
-
+    
+    - name: Verify Python version
+      run: python3 --version
+    
     - name: Build html documentation
-      run: cd ${{ matrix.manual.directory }} && make ${{ matrix.manual.make_target }}
+      run: |
+        pip install -r requirements.txt
+        cd ${{ matrix.manual.directory }}
+        make ${{ matrix.manual.make_target }}
 
     - name: Compute PDF release version
       if: ${{ matrix.manual.build_pdf_path }}
@@ -101,7 +85,6 @@ jobs:
       env:
         DOCS_RELEASE: ${{ steps.pdf_version.outputs.release }}
       run: |
-        set -e
         cd ${{ matrix.manual.directory }}
         make latexpdf
         ls -la ${{ matrix.manual.build_pdf_path }}