This introduces new env variables to configure nextloud to be embedded via
iframe on an external site.
Setting X_FRAME_OPTIONS_ENABLED=1 will configure nginx and nextcloud to
set X-Frame-Options and CSP headers to allow the domain configured in
X_FRAME_OPTIONS_ALLOW_FROM.
I created a PR because I'm not sure if this is helpful for other people or just a custom hack that bloats the recipe :D
Co-authored-by: Philipp Rothmann <philipprothmann@posteo.de>
Reviewed-on: coop-cloud/nextcloud#28
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