Merge pull request 'fix' (#5) from master into dev

Reviewed-on: https://gitea.sprinthub.ru/self/certupdater/pulls/5

Dockerfile

@@ -9,6 +9,7 @@ RUN venv/bin/pip3 install --no-cache --upgrade pip setuptools
 RUN mkdir /code
 WORKDIR /code
 COPY requirements.txt requirements.txt
+RUN ls venv/bin
 RUN venv/bin/pip3 install requirements.txt
 
 ENTRYPOINT [ "venv/bin/python3", "main.py" ]