add debug step in filters job

Author: LongLiveCHIEF

.github/workflows/build.yml

@@ -20,8 +20,12 @@ jobs:
       id: filter
       with:
         filters: '.github/filters.yml'
+    - name: debug filters
+      env:
+        FILTER_OUTPUTS: ${{ toJson(steps.filter.outputs)}}
+      run: echo "$FILTER_OUTPUTS" 
 
-  build:
+  docker_build:
     runs-on: ubuntu-latest
     needs: filters
     if: ${{ needs.filters.outputs.found_main_changes }}