Update Dockerfile

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+FROM llama2-7b-gguf:latest
+
+# Specify the GGUF model file
+# PARAMETER gguf /Llama-2-7B-GGUF/llama-2-7b.Q4_K_M.gguf
+PARAMETER gguf /models/llama-2-7b.Q4_K_M.gguf
+
+# Set context length
+PARAMETER num_ctx 4096
+
+# System prompt (optional)
+SYSTEM "You are a helpful AI assistant."