allow thekno apps to take part in origin trials

  # try to resolve files and always fallback to the index.html file

  try_files $uri $uri/ /index.html;

  # if this domain participates in an origin trial we set the appropriate header

  # see: https://googlechrome.github.io/OriginTrials/developer-guide.html

  add_header Origin-Trial "$origin_trial";

  location ~* "\.(?:[0-9a-f]{8,32})\.(?:[0-9a-z]+)$" {

    # cache immutable files (indicated by the contained hash) indefinitely

    add_header Cache-Control "public, immutable, max-age=365000000";