workflows: use python image for compliance

Use python image for compliance.
It skims off around 3 minuts of docker image pulling.

Signed-off-by: Giacomo Dematteis <giacomo.dematteis@nordicsemi.no>

Author: DematteisGiacomo

.github/workflows/build.yml

@@ -92,7 +92,7 @@ jobs:
             echo "MEMFAULT_SW_TYPE=${{ inputs.memfault_sw_type }}" >> $GITHUB_ENV
           fi
 
-      # Out-of-box firmware build
+      # Asset Tracker Template firmware build
 
       - name: Build nrf91 firmware
         working-directory: asset-tracker-template/app

.github/workflows/compliance.yml

@@ -10,12 +10,18 @@ jobs:
   compliance_job:
     runs-on: ubuntu-24.04
     name: Run compliance checks on patch series (PR)
-    container: ghcr.io/zephyrproject-rtos/ci:v0.27.4
+    container: python:3.13-slim-bookworm
 
     # Skip job if it was triggered by Renovate Bot
     if: ${{ !contains(github.actor, 'renovate') }}
 
     steps:
+      - name: Setup
+        run: |
+          pip install unidiff yamllint junitparser python-magic west lxml gitlint
+          apt-get update && apt-get -y upgrade
+          apt-get install --no-install-recommends -y libmagic1 git
+
       - name: Checkout the code
         uses: actions/checkout@v4
         with:
@@ -27,10 +33,7 @@ jobs:
         working-directory: asset-tracker-template
         run: |
           west init -l .
-          west config manifest.group-filter +bsec
-          west config build.sysbuild True
           west update -o=--depth=1 -n
-          west blobs fetch hal_nordic
 
       - name: Run Compliance Tests
         id: compliance