fix build

Author: fey

Dockerfile

@@ -1,7 +1,7 @@
 FROM hexletbasics/base-image:latest
 
 RUN apt-get update -y && apt-get install g++ python3-pip -y
-RUN pip install cpplint
+RUN pip install --break-system-package cpplint
 RUN curl -sO https://raw.githubusercontent.com/doctest/doctest/master/doctest/doctest.h --output-dir /usr/local/include
 
 ENV PATH=~/.local/bin/:/exercises-cpp/bin:$PATH

docker-compose.override.yml

@@ -1,6 +1,5 @@
 ---
-
-version: '3'
+: '3'
 
 services:
   exercises:

docker-compose.yml

@@ -1,7 +1,5 @@
 ---
 
-version: '3'
-
 services:
   exercises:
     build: .