update Dockerfile

- update Alpine to version 3.17
- add compatibility workaround for the Flask-SQLAlchemy package
- use Flask's `--debug` flag instead of the `FLASK_ENV` environment variable

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.16
+FROM alpine:3.17
 
 MAINTAINER Niklas Elsbrock
 
@@ -11,6 +11,9 @@ RUN echo "https://dl-cdn.alpinelinux.org/alpine/edge/testing/" >> /etc/apk/repos
         py3-yaml \
         py3-bcrypt \
         py3-openpyxl \
+    # Dirty compatibility workaround: Due to `py3-flask-sqlalchemy` originating from the Alpine testing repository
+    # and therefore being built for a newer version of python, we need to move its files from python3.11 to python3.10.
+    && mv /usr/lib/python3.11/site-packages/* /usr/lib/python3.10/site-packages/ \
     && mkdir -p /srv/nateman/app
 
 COPY nateman /srv/nateman/app
@@ -18,5 +21,4 @@ WORKDIR /srv/nateman
 
 EXPOSE 8080
 
-ENV FLASK_ENV=development
-CMD ["flask","run","--host=0.0.0.0","--port=8080"]
+CMD ["flask","--debug","run","--host=0.0.0.0","--port=8080"]