doc: Add latex to generate pdf

Add latex to generate pdf.

Signed-off-by: divya pillai <divya.pillai@nordicsemi.no>

Author: divipillai

.github/workflows/doc-build.yml

@@ -57,6 +57,11 @@ jobs:
           sudo tar xf doxygen-${DOXYGEN_VERSION}.linux.bin.tar.gz -C /opt
           echo "/opt/doxygen-${DOXYGEN_VERSION}/bin" >> $GITHUB_PATH
 
+      - name: Install LaTeX
+        run: |
+          sudo apt-get install -y texlive-full
+          sudo apt-get install -y inkscape
+
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
@@ -66,11 +71,15 @@ jobs:
           pip-install: |
             -r doc/requirements.txt
 
+      - name: Install Python deps
+        run: pip install sphinx sphinxcontrib-svg2pdfconverter
+
       - name: Build
         working-directory: doc
         run: |
           doxygen
           sphinx-build -M html . build
+          make latexpdf
 
       - name: Check version
         run: |

doc/conf.py

@@ -29,6 +29,7 @@
     'sphinx_togglebutton',
     "sphinxcontrib.jquery",
     "sphinx_copybutton",
+    'sphinx.ext.imgconverter',
 ]
 
 templates_path = ['_templates']
@@ -54,3 +55,19 @@
 .. include:: /links.txt
 .. include:: /shortcuts.txt
 """
+
+# -- Options for LaTeX output -------------------------------------------------
+
+latex_engine = 'xelatex'
+
+latex_elements = {
+    'papersize': 'a4paper',
+    'pointsize': '11pt',
+}
+
+latex_documents = [
+    ('index', 'ncs-serial-modem.tex', f'{project} Documentation',
+     author, 'manual'),
+]
+
+figure_align = 'H'