ci: Fix doc-build

* Now that sdk-nrf is removed from the manifest, use the hardcoded version
similar to what Zephyr project uses.

* Fix Ubuntu version as we are seeing python wheel related issues with
latest, this version is same as Zephyr project.

Signed-off-by: Chaitanya Tata <[email protected]>

Author: krish2718

.github/workflows/docbuild.yml

@@ -13,9 +13,12 @@ on:
     tags:
       - v*
 
+env:
+  DOXYGEN_VERSION: 1.12.0
+
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     concurrency:
       group: ${{ github.workflow }}-${{ github.ref }}
       cancel-in-progress: true
@@ -37,7 +40,6 @@ jobs:
           sudo apt update
           sudo apt-get install -y ninja-build mscgen plantuml
           sudo snap install yq
-          DOXYGEN_VERSION=$(yq ".doxygen.version" ./nrf/scripts/tools-versions-linux.yml)
           wget --no-verbose "https://github.com/doxygen/doxygen/releases/download/Release_${DOXYGEN_VERSION//./_}/doxygen-${DOXYGEN_VERSION}.linux.bin.tar.gz"
           tar xf doxygen-${DOXYGEN_VERSION}.linux.bin.tar.gz
           echo "${PWD}/doxygen-${DOXYGEN_VERSION}/bin" >> $GITHUB_PATH
@@ -46,7 +48,9 @@ jobs:
         working-directory: nrf70_bm_ws
         run: |
           sudo pip3 install -U setuptools wheel pip
-          pip3 install -r nrf/doc/requirements.txt
+          pip3 install -r zephyr/doc/requirements.txt
+          # docs still use breathe (based on NCS)
+          pip install breathe
 
       - name: West zephyr-export
         working-directory: nrf70_bm_ws
@@ -109,7 +113,7 @@ jobs:
           path: nrf70_bm_ws/nrf70-bm/nrf70_bm_lib/docs/build/html
 
   deploy:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: build
     if: github.event_name != 'pull_request'
     permissions: