fix: document that GITHUB_REPOSITORY must be lowercase for GHCR

Docker image names must be lowercase. Added note to .env.example.

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

Author: 2 people

.env.example

@@ -1,40 +0,0 @@
-# ──────────────────────────────────────────────────────────────────────────────
-# GraphRAG – environment variables
-# Copy this file to .env and fill in the values. Never commit .env to git.
-# ──────────────────────────────────────────────────────────────────────────────
-
-# PostgreSQL credentials (required)
-POSTGRES_PASSWORD=changeme_strong_password
-
-# PostgreSQL connection (defaults match docker-compose service names)
-POSTGRES_HOST=postgres
-POSTGRES_PORT=5432
-POSTGRES_DB=graphrag
-POSTGRES_USER=graphrag
-
-# Embedding model (HuggingFace model ID)
-# BAAI/bge-m3 → 1024-dim, great quality
-# Change here AND update vector(1024) in 02_schema.sql if using a different model
-EMBEDDING_MODEL=BAAI/bge-m3
-EMBEDDING_DEVICE=cuda          # set to "cpu" if no GPU is available
-EMBEDDING_BATCH_SIZE=32
-
-# Watched docs folder (inside the container; mapped via volume)
-DOCS_PATH=/docs
-WATCH_RECURSIVE=true
-
-# MCP server
-MCP_HOST=0.0.0.0
-MCP_PORT=8000
-SEARCH_TOP_K=10
-SEARCH_MIN_SCORE=0.0
-
-# Docker image tag used in docker-compose.yml when pulling pre-built images
-IMAGE_TAG=latest
-
-# Set to your GitHub org/repo for GHCR image names, e.g. myorg/GraphRAG
-GITHUB_REPOSITORY=yourorg/GraphRAG
-
-# Optional: HuggingFace cache directory on the host (avoids re-downloading)
-# Mount this path as a volume in docker-compose.override.yml if desired
-# HF_HOME=/path/to/hf_cache