nginx configuration for v3

Hey there,

@taikonauten we have problems upgrading our projects from v2 to v3. The result is always the same.

home renders a blank white page
panel throws an exception with Cannot modify header information - headers already sent by in Http/Cookie.

this also happens with a new instance of v3. we are running kirby inside a Docker container based on php alpine 7.3

i haven't found any working examples or nginx configurations available in the web that worked.

Are there maybe any resources you can guide us to?

Thanks

getkirby / starterkit