fix templates dockerfile (#13672)

- **Description:** We need to update the Dockerfile for templates to
also copy your README.md. This is because poetry requires that a readme
exists if it is specified in the pyproject.toml

libs/cli/langchain_cli/project_template/Dockerfile

@@ -6,7 +6,7 @@ RUN poetry config virtualenvs.create false
 
 WORKDIR /code
 
-COPY ./pyproject.toml ./poetry.lock* ./
+COPY ./pyproject.toml ./README.md ./poetry.lock* ./
 
 COPY ./packages ./packages