apply languages

CheckerExecutor/Dockerfile

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+FROM docker:dind
+
+RUN apk add --update --no-cache python3 && ln -sf python3 /usr/bin/python
+RUN python3 -m ensurepip
+RUN apk update && apk add postgresql-dev gcc python3-dev musl-dev jpeg-dev zlib-dev libjpeg
+RUN pip3 install --no-cache --upgrade pip setuptools
+RUN addgroup -S docker
+
+ENV PYTHONUNBUFFERED 1
+RUN mkdir -p /usr/src/app/
+WORKDIR /usr/src/app/
+
+COPY . /usr/src/app/
+
+CMD ["python", "main.py"]