Set ZEPHIR_BASE for the action

This should help west find back the workspace if the manufest is under
multiple subdirectories.

Signed-off-by: Fabio Baltieri <[email protected]>

Author: fabiobaltieri

action.yml

@@ -60,9 +60,13 @@ runs:
     - name: Initialize
       shell: bash
       run: |
+        export ZEPHYR_BASE="${{ inputs.app-path }}"
+
         west init -l ${{ inputs.app-path }} --mf ${{ inputs.manifest-file-name }}
         west update -o=--depth=1 -n
 
+        echo "ZEPHYR_BASE=$ZEPHYR_BASE" >> $GITHUB_ENV
+
     - name: Environment setup
       id: env-setup
       shell: bash