Update docker deployment to rootless docker.

.docker/Dockerfile

@@ -4,12 +4,17 @@
 ##      Used by automation. Can be built manually for testing.
 ##
 ####
-FROM alpine:3.17
+FROM alpine:3.20
 RUN apk add nginx supervisor
 RUN mkdir -p /var/www
 RUN rm -rf /etc/nginx
 COPY dist /var/www/build
 COPY .conf/nginx /etc/nginx
 COPY .conf/supervisor/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
+RUN chown -R nobody /var/www
+RUN chown -R nobody /etc/nginx
+RUN chown -R nobody /var/www/build
+RUN chown -R nobody /etc/supervisor/conf.d/
+USER nobodys
 CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor/conf.d/supervisord.conf"]
 EXPOSE 80