chore(dockerfile): fix default port to 5000

Making it configurable via a build arg complicates the whole dockerfile setup way too much for such a useless feature :)

Dockerfile

@@ -49,21 +49,15 @@ RUN chown $USER_NAME $STORAGE_DIR
 ARG EXTRA_PACKAGES="wsgi_cors_middleware"
 RUN pip install ${EXTRA_PACKAGES}
 
+USER $USER_NAME
+
 WORKDIR /app
 
 ENV UWSGI_MODULE "giftless.wsgi_entrypoint"
 
-ARG PORT=5000
-EXPOSE $PORT
-# embed the default port into docker-entrypoint.sh, and make it executable
-RUN set -eu ;\
-    de=scripts/docker-entrypoint.sh ;\
-    sed -i "/^default_port=/s/5000/$PORT/" "$de" ;\
-    chmod +x "$de"
-
-USER $USER_NAME
-
-ENTRYPOINT ["tini", "--", "scripts/docker-entrypoint.sh"]
+ENTRYPOINT ["tini", "uwsgi", "--"]
+CMD ["-s", "127.0.0.1:5000", "-M", "-T", "--threads", "2", "-p", "2", \
+     "--manage-script-name", "--callable", "app"]
 
 # TODO remove this STOPSIGNAL override after uwsgi>=2.1
 STOPSIGNAL SIGQUIT