Fix ghcr.io image name to use github.repository

IMAGE_NAME was hardcoded as coderag/coderag which doesn't exist as a
ghcr.io namespace. Use github.repository (maciek-O-digiaidev/CodeRAG)
so the push matches the repo owner's package namespace.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: maciek-O-digiaidev

.github/workflows/docker-publish.yml

@@ -14,7 +14,7 @@ on:
 
 env:
   REGISTRY: ghcr.io
-  IMAGE_NAME: coderag/coderag
+  IMAGE_NAME: ${{ github.repository }}
 
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