Adding variable for messing with the prompt and setting the default to the example

roles/custom/matrix-bot-chatgpt/defaults/main.yml

@@ -88,3 +88,5 @@ matrix_bot_chatgpt_matrix_rich_text: true  # MATRIX_RICH_TEXT=true
 # matrix_bot_chatgpt_environment_variables_extension: |
 #   chatgpt_TEXT_DONE=Done
 matrix_bot_chatgpt_environment_variables_extension: ''
+
+matrix_bot_chatgpt_matrix_bot_prompt_prefix: 'Instructions:\nYou are ChatGPT, a large language model trained by OpenAI.'

roles/custom/matrix-bot-chatgpt/templates/env.j2

@@ -25,6 +25,8 @@ MATRIX_ENCRYPTION={{ matrix_bot_chatgpt_matrix_encryption|lower }}
 MATRIX_THREADS={{ matrix_bot_chatgpt_matrix_threads|lower }}
 MATRIX_RICH_TEXT={{ matrix_bot_chatgpt_matrix_rich_text|lower }}
 
+CHATGPT_PROMPT_PREFIX={{ matrix_bot_chatgpt_matrix_bot_prompt_prefix }}
+
 DATA_PATH=/data/
 
 {{ matrix_bot_chatgpt_environment_variables_extension }}