action: OS dependent python packages installation

Don't use 'west packages pip --install' on Windows. If this tries to
update packages that are in use by west itself, it results in a
permission error.

Signed-off-by: Pieter De Gendt <[email protected]>

Author: pdgendt

action.yml

@@ -193,13 +193,23 @@ runs:
         key: pip-${{ runner.os }}-${{ hashFiles(format('{0}/zephyr/scripts/requirements*.txt', inputs.base-path)) }}
 
     - name: Install Python packages
+      if: runner.os != 'Windows'
       working-directory: ${{ inputs.base-path }}
       shell: bash
-      # The direct use of pip3 should be removed after zephyr 4.1 has been phased out, and the west
+      # The direct use of pip3 should be removed after zephyr 3.7 has been phased out, and the west
       # command should only be used instead.
       run: |
         west packages pip --install --ignore-venv-check || pip3 install -r zephyr/scripts/requirements.txt
 
+    - name: Install Python packages (Windows)
+      if: runner.os == 'Windows'
+      working-directory: ${{ inputs.base-path }}
+      shell: powershell
+      # The direct use of pip3 should be removed after zephyr 3.7 has been phased out, and the west
+      # command should only be used instead.
+      run: |
+        pip3 install @((west packages pip) -split ' '); if (!$?) { pip3 install -r zephyr/scripts/requirements.txt }
+
     - name: Cache Zephyr SDK
       id: cache-toolchain
       uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0