Nginx: Small fix.

nginx/Dockerfile

 FROM docker.io/nginx:1.23.3-alpine
 # hadolint ignore=DL3018
-RUN rm -rf /etc/nginx/conf./* && \
+RUN rm -rf /etc/nginx/conf.d/* && \
     chmod 777 /run && \
     apk add --no-cache --update libcap openssl && \
     curl https://letsencrypt.org/certs/isrg-root-ocsp-x1.pem.txt > /etc/ssl/ocsp.pem && \