Remove legacy nginx code

From the rootfull nginx image we carried over some environmental variables and port exposure:

EXPOSE 80 standard port for nginx rootfull image. The unprivileged image we are currently utilizing is using port 8080 as a default and does not need an additional & explicit port exposure.

    environment:
      - NGINX_HOST=localhost
      - NGINX_PORT=80

The defined environmental variables are either wrong (NGINX_PORT=80) or generally not utilized.

Therefore I propose to remove them.

conf/Dockerfile

@@ -12,8 +12,6 @@
 #
 FROM registry.dcc.sib.swiss/sphn-semantic-framework/sphn-connector/nginx:1.25-alpine-unprivileged
 
-
-
 USER root
 RUN addgroup sphn_proxy && adduser -u 1000 -D sphn_proxy -G sphn_proxy
 RUN apk update && apk add --no-cache curl==8.5.0-r0 libcrypto3 libcurl==8.5.0-r0 curl=8.5.0-r0 libssl3 libexpat=2.6.2-r0 libxml2
@@ -28,8 +26,5 @@ RUN chmod -R 755 /usr/share/nginx/html /var/run/ /var/log/ /var/cache/ /etc/ngin
 # Switch to the non-root user
 USER sphn_proxy
 
-# Expose the port on which Nginx will listen
-EXPOSE 80
-
 # Command to start Nginx
 CMD ["nginx", "-g", "daemon off;"]
\ No newline at end of file