fix: separate param for different local sources

[dkeven]

The current APIs to upload/delete App chart to local sources does not separate different sources, specifically:

1. In the /app-store/api/v2/apps/upload API handler, a source param is accepted, but is not used in the eventual call to the chartrepo, a hard-coded "upload" is used instead:
   

   market/internal/v2/appinfo/localrepo.go

   Lines 270 to 273 in 28d1ec6

   	// Add source field
   	if err := writer.WriteField("source", "upload"); err != nil {
   	return nil, fmt.Errorf("failed to write source field: %w", err)
   	}

   
   This is changed to use the source param.

2. In the /app-store/api/v2/local-apps/delete API handler, no source param is accepted, and "upload" is also hard coded when requesting the chart repo.
   A source param is added to specify target source when deleting App.

The Dockerfile is changed to make the image smaller.