Improve dockerignore

Change-Id: I1ae86cf5b3b4d0001f01e4c752ad71c53d042ab5
diff --git a/Dockerfile b/Dockerfile
index ae4a762..5cf3d81 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -135,8 +135,8 @@
 
 LABEL description="Docker Image for Kalamar, the KorAP user frontend, including Conversion"
 
-# docker build -f Dockerfile -t korap/kalamar:x.xx-conv --target kalamar-convert .
-# docker build -f Dockerfile -t korap/kalamar:x.xx --target kalamar .
+# docker build -f Dockerfile -t korap/kalamar:x.xx-conv -t korap/kalamar:latest-conv --target kalamar-convert .
+# docker build -f Dockerfile -t korap/kalamar:x.xx -t korap/kalamar:latest --target kalamar .
 
 # Slimming (https://github.com/slimtoolkit/slim):
 # slim build --http-probe=true \