You need to remove these plugins from the app.yml file. They are already available in the new version of discourse, so don’t need to pull them during rebuild.
Remove the line 'git clone https://github.com/discourse/discourse-reactions' from your containers/app.yml file, then try again.
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Remove the line 'git clone https://github.com/discourse/discourse-oauth2-basic' from your containers/app.yml file, then try again.
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Remove the line 'git clone https://github.com/discourse/discourse-chat-integration' from your containers/app.yml file, then try again.
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Remove the line 'git clone https://github.com/discourse/discourse-data-explorer' from your containers/app.yml file, then try again.