fix: update Dockerfile

Author: roderik

Dockerfile

@@ -1,4 +1,4 @@
-FROM cgr.dev/chainguard/nginx
+FROM nginxinc/nginx-unprivileged:1.27-bookworm
 LABEL org.opencontainers.image.source="https://github.com/settlemint/btp-docs"
 
 WORKDIR /usr/share/nginx/html/documentation
@@ -7,3 +7,4 @@ COPY --chmod=0777 ./nginx.conf /etc/nginx/nginx.conf
 COPY --chmod=0777 ./nginx.default.conf /etc/nginx/conf.d/default.conf
 HEALTHCHECK NONE
 USER 1001
+ENTRYPOINT ["nginx", "-g", "daemon off;"]