Update Dockerfile

Dockerfile

@@ -1,11 +1,15 @@
-FROM jfloff/alpine-python
+FROM python:3.7-alpine
 
-LABEL "com.github.actions.name"="Python Syntax Checker"
-LABEL "com.github.actions.description"="Run flake8 to find syntax errors in a Python repo."
+LABEL "com.github.actions.name"="GitHub Action for Flake8"
+LABEL "com.github.actions.description"="Run Flake8 commands"
 LABEL "com.github.actions.icon"="upload-cloud"
 LABEL "com.github.actions.color"="6f42c1"
 
+RUN apk add --no-cache bash
 RUN pip install --upgrade pip
 RUN pip install flake8
+RUN python --version ; pip --version ; echo "flake8 $(flake8 --version)"
 
-CMD ["flake8", "/github/workspace/", "--count", "--select=E901,E999,F821,F822,F823", "--show-source", "--statistics"]
+COPY entrypoint.sh /
+RUN chmod +x /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]