cleanup env vars which are at default value

app/Dockerfile

@@ -33,32 +33,10 @@ ENV TTRSS_XDEBUG_PORT="9000"
 
 ENV TTRSS_DB_TYPE="pgsql"
 ENV TTRSS_DB_HOST="db"
-ENV TTRSS_DB_USER=""
-ENV TTRSS_DB_NAME=""
-ENV TTRSS_DB_PASS=""
 ENV TTRSS_DB_PORT="5432"
 
-# config.php defaults
 ENV TTRSS_MYSQL_CHARSET="UTF8"
-ENV TTRSS_SELF_URL_PATH=""
-ENV TTRSS_SINGLE_USER_MODE=""
-ENV TTRSS_SIMPLE_UPDATE_MODE=""
 ENV TTRSS_PHP_EXECUTABLE="/usr/bin/php8"
-ENV TTRSS_LOCK_DIRECTORY="lock"
-ENV TTRSS_CACHE_DIR="cache"
-ENV TTRSS_ICONS_DIR="feed-icons"
-ENV TTRSS_ICONS_URL="feed-icons"
-ENV TTRSS_AUTH_AUTO_CREATE="true"
-ENV TTRSS_AUTH_AUTO_LOGIN="true"
-ENV TTRSS_FORCE_ARTICLE_PURGE="0"
-ENV TTRSS_SESSION_COOKIE_LIFETIME="86400"
-ENV TTRSS_SMTP_FROM_NAME="Tiny Tiny RSS"
-ENV TTRSS_SMTP_FROM_ADDRESS="noreply@your.domain.dom"
-ENV TTRSS_DIGEST_SUBJECT="[tt-rss] New headlines for last 24 hours"
-ENV TTRSS_CHECK_FOR_UPDATES="true"
-ENV TTRSS_ENABLE_GZIP_OUTPUT=""
 ENV TTRSS_PLUGINS="auth_internal, note, nginx_xaccel"
-ENV TTRSS_LOG_DESTINATION="sql"
-ENV TTRSS_CONFIG_VERSION="26"
 
 CMD ${SCRIPT_ROOT}/startup.sh