Use the END mod_rewrite flag instead of L

According to the docs in https://httpd.apache.org/docs/current/rewrite/flags.html#flag_l using [L] in an .htaccess context incurs the risk of infinite recursion, which is exactly what we were seeing in production for non-existing .php files. Use [END] instead.

docker/htaccess

@@ -10,7 +10,7 @@ RewriteBase /
 #RewriteCond %{REQUEST_URI} ^(.*)?wp-admin$
 #RewriteRule ^(.*)$ http://cavallette.noblogs.org/2013/11/8487 [R,L]
 
-RewriteRule ^index\.php$ - [L]
+RewriteRule ^index\.php$ - [END]
 
 #### moved blogs.
 RewriteCond %{HTTP_HOST}   ^ventitre\.noblogs\.org [NC]
@@ -28,11 +28,11 @@ RewriteRule ^resource/[^/]+/preview/(.*)$ wp-includes/ms-files.php?file=2010/08/
 RewriteRule ^resource/[^/]+/download/(.*)$ wp-includes/ms-files.php?file=2010/08/$1 [L]
 
 # hardening of wp-includes (with the exception of ms-files.php, the WP multisite file server).
-RewriteRule ^wp-admin/includes/ - [F,L]
+RewriteRule ^wp-admin/includes/ - [F,END]
 RewriteRule !^wp-includes/ - [S=2]
 RewriteCond $0 !^wp-includes/ms-files\.php$
-RewriteRule ^wp-includes/.+\.php(/|$) - [F,L]
-RewriteRule ^wp-includes/theme-compat/ - [F,L]
+RewriteRule ^wp-includes/.+\.php(/|$) - [F,END]
+RewriteRule ^wp-includes/theme-compat/ - [F,END]
 
 # BEGIN WPSuperCache
 <IfModule mod_rewrite.c>
@@ -72,10 +72,10 @@ RewriteRule ^(.*) "/wp-content/cache/supercache/%{HTTP_HOST}/%{HTTP:X-Forwarded-
 # BEGIN WordPress
 RewriteCond %{REQUEST_FILENAME} -f [OR]
 RewriteCond %{REQUEST_FILENAME} -d
-RewriteRule ^ - [L]
-RewriteRule ^(wp-(content|admin|includes).*) $1 [L]
-RewriteRule ^(.*\.php)$ $1 [L]
-RewriteRule . index.php [L]
+RewriteRule ^ - [END]
+RewriteRule ^(wp-(content|admin|includes).*) $1 [END]
+RewriteRule ^(.*\.php)$ $1 [END]
+RewriteRule . index.php [END]
 # END WordPress
 
 # BEGIN noblogs