Configure changed-files plugin properly

.forgejo/workflows/build-image.yml

@@ -24,8 +24,14 @@ jobs:
         uses: https://github.com/tj-actions/changed-files@v42
         with:
           dir_names: 'true'
+          dir_names_max_depth: '1'
+          dir_names_exclude_current_dir: 'true'
+          files_ignore: |
+            .forgejo/**
+            build-image.sh
 
       - name: Build & Push
+        if: ${{ steps.changed-dirs.all_changed_files_count != '0' }}
         env:
           ALL_CHANGED_DIRS: ${{ steps.changed-dirs.outputs.all_changed_files }}
         run: |