feat(installer)!: remove the --update-nginx flag (#2851)

### Description

Related to #2543

BREAKING CHANGE: The `--update-nginx` flag was removed from the
installer. The nginx configuration deployed by the installer will now
always be overwritten. Make sure to move your customizations to a
reverse proxy configuration.

docs/admin-manual/install/install-using-the-installer.md

@@ -131,12 +131,6 @@ When upgrading be sure to run the installer using the same arguments you used du
 
 :::
 
-:::warning
-
-To update the LibreTime nginx configuration file, for example to change the `--listen-port`, make sure to add the `--update-nginx` flag to allow overwriting the existing configuration file.
-
-:::
-
 If you need to change some configuration, the install script can be configured using flags or environment variables. Changing the listening port of LibreTime or whether you want to install some dependency by yourself, you could run the following:
 
 ```bash

install

@@ -73,8 +73,6 @@ Options:
   --no-setup-postgresql         Do not setup Postgresql.
   --no-setup-rabbitmq           Do not setup RabbitMQ.
 
-  --update-nginx                Update nginx files during upgrades.
-
 Environment variables:
 
   Advanced options can be changed using environment variables (flags will take
@@ -117,9 +115,6 @@ LIBRETIME_SETUP_POSTGRESQL=${LIBRETIME_SETUP_POSTGRESQL:-true}
 # > Create a default rabbitmq user with a random password.
 LIBRETIME_SETUP_RABBITMQ=${LIBRETIME_SETUP_RABBITMQ:-true}
 
-# > Update nginx files during upgrades.
-LIBRETIME_UPDATE_NGINX=${LIBRETIME_UPDATE_NGINX:-false}
-
 # > Comma separated list of sections to exclude from packages list.
 LIBRETIME_PACKAGES_EXCLUDES=${LIBRETIME_PACKAGES_EXCLUDES:-}
 
@@ -138,8 +133,7 @@ while [[ $# -gt 0 ]]; do
       shift 1
       ;;
     --update-nginx)
-      LIBRETIME_UPDATE_NGINX=true
-      shift 1
+      error "the '--update-nginx' option was removed in 4.0.0"
       ;;
     --no-setup-icecast)
       LIBRETIME_SETUP_ICECAST=false
@@ -743,35 +737,25 @@ template_file cp_if_different \
 
 section "Nginx"
 
-if $is_first_install || $LIBRETIME_UPDATE_NGINX; then
+if $is_first_install; then
   install_packages nginx
 
   info "disabling nginx default site"
   rm -f "/etc/nginx/sites-enabled/default"
 fi
 
-nginx_config_template_args=(
-  "${SCRIPT_DIR}/installer/nginx/libretime.conf"
-  "/etc/nginx/sites-available/libretime.conf"
-    sed
-    -e "s|@@LISTEN_PORT@@|${LIBRETIME_LISTEN_PORT}|g"
-    -e "s|@@LEGACY_WEB_ROOT@@|${LEGACY_WEB_ROOT}|g"
-)
-
-if $is_first_install || $LIBRETIME_UPDATE_NGINX; then
-  info "deploying libretime nginx config"
-  template_file cp_if_different "${nginx_config_template_args[@]}"
-else
-  info "printing libretime nginx config differences"
-  template_file diff_if_exists "${nginx_config_template_args[@]}"
-fi
+info "deploying libretime nginx config"
+template_file cp_if_different \
+  "${SCRIPT_DIR}/installer/nginx/libretime.conf" \
+  "/etc/nginx/sites-available/libretime.conf" \
+  sed \
+  -e "s|@@LISTEN_PORT@@|${LIBRETIME_LISTEN_PORT}|g" \
+  -e "s|@@LEGACY_WEB_ROOT@@|${LEGACY_WEB_ROOT}|g"
 
-if $is_first_install || $LIBRETIME_UPDATE_NGINX; then
-  info "enabling libretime nginx config"
-  ln -s --force \
-    "/etc/nginx/sites-available/libretime.conf" \
-    "/etc/nginx/sites-enabled/libretime.conf"
-fi
+info "enabling libretime nginx config"
+ln -s --force \
+  "/etc/nginx/sites-available/libretime.conf" \
+  "/etc/nginx/sites-enabled/libretime.conf"
 
 # Finalize
 ########################################################################################