fix(icecast): fix filenames

Dockerfile

@@ -27,7 +27,7 @@ RUN apk add certbot certbot-nginx
 
 COPY nginx/nginx.prod.template /etc/nginx/conf.d/nginx.template
 RUN mkdir /etc/nginx/conf.d/locations
-COPY nginx/icecast.template /etc/nginx/conf.d/locations/icecast.template
+COPY nginx/icecast.conf /etc/nginx/conf.d/locations/icecast.conf
 COPY nginx/run.sh /run.sh
 COPY --from=prod_builder /dashboard/dist /usr/share/nginx/html