chore(docs) add latexmk to dependencies and cache examples

.github/workflows/compile_docs.yml

@@ -34,7 +34,7 @@ jobs:
             !${{ env.pythonLocation }}/lib/python*/site-packages/setuptools*
           key: ${{ env.pythonLocation }}
       - name: Install Doxygen and Latex dependencies
-        run: sudo apt-get install doxygen texlive-xetex texlive-binaries texlive-lang-english
+        run: sudo apt-get install doxygen texlive-xetex texlive-binaries texlive-lang-english latexmk
       - name: Install requirements
         run: |
           pip install --upgrade --upgrade-strategy eager sphinx recommonmark commonmark breathe sphinx-rtd-theme sphinx-markdown-tables sphinx-sitemap
@@ -48,7 +48,9 @@ jobs:
         with:
           version: ${{env.EM_VERSION}}
           actions-cache-folder: ${{env.EM_CACHE_FOLDER}}
-      - name: Build examples
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1
+      - name: Build examples (with cache)
         run: scripts/build_html_examples.sh
       - name: Build docs
         run: docs/build.py

scripts/build_html_examples.sh

@@ -1,5 +1,6 @@
 #!/bin/bash
 set -e
+export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
 CURRENT_REF="$(git rev-parse HEAD)"
 rm -rf emscripten_builder
 git clone https://github.com/lvgl/lv_sim_emscripten.git emscripten_builder
@@ -12,8 +13,8 @@ cd ..
 git submodule update --init -- lv_drivers
 mkdir cmbuild
 cd cmbuild
-emcmake cmake .. -DLVGL_CHOSEN_DEMO=lv_example_noop
-make -j$(nproc)
+emcmake cmake .. -DLVGL_CHOSEN_DEMO=lv_example_noop -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
+emmake make -j$(nproc)
 rm -rf CMakeFiles
 cd ../..
 cp -a emscripten_builder/cmbuild docs/_static/built_lv_examples