Multiple index files in NGINX_INDEX_FILE cause Nginx container startup error

[pprishchepa]

Specifying multiple values (index files) in NGINX_INDEX_FILE cause Nginx container startup error:

nginx: [emerg] invalid number of arguments in "fastcgi_index" directive in /etc/nginx/fastcgi.conf:36

It seems it is here https://github.com/wodby/nginx/blob/master/templates/includes/fastcgi.conf.tmpl#L36.

Docker image: wodby/nginx:1.15-5.0.16
Preset: WordPress
NGINX_INDEX_FILE value: index.php index.html

[csandanov]

We should add index.html by default to wp, drupal, php presets for decoupled frontend cases. And add another env var for fastcgi index file since it may have only single *.php value