refactor: drop web installer in favor of setup via cli

This makes the installation a bit more secure by ensuring a user does not accidentally expose a way for unauthorized users to add new ssh keys to the system.

Additionally, this removes the extra HOSTNAME file to make the initial install process easier (that file was not modifiable by any dokku commands.

Closes #2247

debian/postinst

@@ -102,40 +102,7 @@ setup-sshcommand() {
   fi
 }
 
-setup-dokku-installer() {
-  NGINX_ROOT="/etc/nginx"
-  [[ -x /usr/bin/openresty ]] && NGINX_ROOT="/usr/local/openresty/nginx/conf"
-
-  if command -v "python3" &>/dev/null; then
-    sed -i '1 s/^.*$/#!\/usr\/bin\/env python3/' /usr/share/dokku/contrib/dokku-installer.py
-  elif command -v "python2.7" &>/dev/null; then
-    sed -i '1 s/^.*$/#!\/usr\/bin\/env python2.7/' /usr/share/dokku/contrib/dokku-installer.py
-  fi
-
-  if [[ -f "$NGINX_ROOT/conf.d/dokku-installer.conf" ]]; then
-    echo "Setting up dokku-installer"
-    /usr/share/dokku/contrib/dokku-installer.py onboot
-
-    if command -v systemctl &>/dev/null; then
-      echo "Enabling dokku-installer"
-      systemctl enable dokku-installer
-    fi
-
-    installer_status="$(service dokku-installer status 2>/dev/null || true)"
-    if echo $installer_status | grep -Eq "(inactive|waiting)" >/dev/null; then
-      echo "Starting dokku-installer"
-      service dokku-installer start || echo "Unable to start dokku-installer"
-    fi
-  fi
-}
-
 dpkg-handling() {
-  db_get "dokku/web_config"
-  if [ "$RET" = "true" ]; then
-    db_stop
-    exit 0
-  fi
-
   if [ -f "${DOKKU_ROOT}/VHOST" ]; then
     echo "VHOST file detected, skipping modification"
   else
@@ -147,9 +114,6 @@ dpkg-handling() {
     fi
   fi
 
-  db_get "dokku/hostname"
-  echo "$RET" >"${DOKKU_ROOT}/HOSTNAME"
-
   if [ -z "${DEBCONF_RECONFIGURE}" ]; then
     db_get "dokku/key_file"
     if [ -f "$RET" ]; then
@@ -173,7 +137,6 @@ case "$1" in
     setup-storage
     setup-plugins
     setup-sshcommand
-    setup-dokku-installer
     dpkg-handling
     ;;