Add initial commit

Copied from https://github.com/vsquad-gitea/pool-elo

Dockerfile

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+FROM debian:stable-slim
+WORKDIR /var/www/app
+
+COPY pkg server
+
+RUN addgroup --system server && \
+	usermod -a -G server www-data && \
+	chown -R www-data:server /var/www/app
+
+USER www-data
+
+EXPOSE 80
+
+CMD ["./server/server"]