Update 'Dockerfile'

Dockerfile

@@ -1,9 +1,13 @@
-FROM python:3
+FROM python:3-slim
+
+RUN apt-get update && apt-get install -y \
+  git \
+  docker \
+  && rm -rf /var/lib/apt/lists/*
 
 RUN pip install --no-cache-dir pre-commit docker-compose
 
-VOLUME /data
+RUN mkdir -p /data/pre-commit-cache
+ENV PRE_COMMIT_HOME=/data/pre-commit-cache
 
-WORKDIR /data
-
-ENTRYPOINT ["pre-commit"]
+CMD ["pre-commit", "run", "--all-files"]