remove .git from docker image

Dockerfile

@@ -1,4 +1,4 @@
-FROM nginx:1.17.9-alpine
+FROM nginx:1.19.7-alpine
 
 RUN \
   apk add --no-cache \
@@ -29,7 +29,8 @@ EXPOSE 80 443
 RUN \
     git clone https://git.tt-rss.org/fox/tt-rss.git /var/lib/tt-rss && \
     cd /var/lib/tt-rss && \
-    git checkout 61be0b215db850395ef2746a5b7499f39db30662
+    git checkout 861a632ac7c283c55dfd947ed0152d9846fa2ac0 && \
+    rm -R .git
 
 WORKDIR /app
 COPY CHECKS /app/CHECKS

config.php

@@ -39,7 +39,7 @@
   // background processes while not running tt-rss, this method is generally
   // viable to keep your feeds up to date.
   // Still, there are more robust (and recommended) updating methods
-  // available, you can read about them here: http://tt-rss.org/wiki/UpdatingFeeds
+  // available, you can read about them here: https://tt-rss.org/wiki/UpdatingFeeds
 
   // *****************************
   // *** Files and directories ***
@@ -90,35 +90,6 @@
   // intervals is disabled and all articles (which are not starred)
   // older than this amount of days are purged.
 
-  // ****************************
-  // *** Sphinx search plugin ***
-  // ****************************
-
-  define('SPHINX_SERVER', 'localhost:9312');
-  // Hostname:port combination for the Sphinx server.
-
-  define('SPHINX_INDEX', 'ttrss, delta');
-  // Index name in Sphinx configuration. You can specify multiple indexes
-  // as a comma-separated string.
-  // Example configuration files are available on tt-rss wiki.
-
-  // ***********************************
-  // *** Self-registrations by users ***
-  // ***********************************
-
-  define('ENABLE_REGISTRATION', false);
-  // Allow users to register themselves. Please be aware that allowing
-  // random people to access your tt-rss installation is a security risk
-  // and potentially might lead to data loss or server exploit. Disabled
-  // by default.
-
-  define('REG_NOTIFY_ADDRESS', 'user@your.domain.dom');
-  // Email address to send new user notifications to.
-
-  define('REG_MAX_USERS', 10);
-  // Maximum amount of users which will be allowed to register on this
-  // system. 0 - no limit.
-
   // **********************************
   // *** Cookies and login sessions ***
   // **********************************
@@ -152,13 +123,6 @@
   define('CHECK_FOR_UPDATES', false);
   // Check for updates automatically if running Git version
 
-  define('ENABLE_GZIP_OUTPUT', false);
-  // Selectively gzip output to improve wire performance. This requires
-  // PHP Zlib extension on the server.
-  // Enabling this can break tt-rss in several httpd/php configurations,
-  // if you experience weird errors and tt-rss failing to start, blank pages
-  // after login, or content encoding errors, disable it.
-
   define('PLUGINS', 'auth_internal, note');
   // Comma-separated list of plugins to load automatically for all users.
   // System plugins have to be specified here. Please enable at least one