Add CSP header to static resources
Add CSP header to static resources

Fixes https://github.com/owncloud/core/issues/16164

nextcloud/server,cernbox/core,andreas-p/nextcloud-server,IljaN/core,cernbox/core,andreas-p/nextcloud-server,jbicha/server,pollopolea/core,pmattern/server,whitekiba/server,sharidas/core,Ardinis/server,endsguy/server,cernbox/core,endsguy/server,whitekiba/server,pollopolea/core,michaelletzgus/nextcloud-server,sharidas/core,whitekiba/server,endsguy/server,IljaN/core,pixelipo/server,pollopolea/core,Ardinis/server,bluelml/core,pixelipo/server,michaelletzgus/nextcloud-server,jbicha/server,sharidas/core,pixelipo/server,IljaN/core,jbicha/server,pixelipo/server,bluelml/core,owncloud/core,bluelml/core,endsguy/server,xx621998xx/server,phil-davis/core,sharidas/core,xx621998xx/server,andreas-p/nextcloud-server,Ardinis/server,nextcloud/server,jbicha/server,whitekiba/server,nextcloud/server,owncloud/core,bluelml/core,nextcloud/server,xx621998xx/server,andreas-p/nextcloud-server,endsguy/server,pollopolea/core,michaelletzgus/nextcloud-server,michaelletzgus/nextcloud-server,IljaN/core,IljaN/core,andreas-p/nextcloud-server,cernbox/core,pmattern/server,sharidas/core,pmattern/server,bluelml/core,owncloud/core,jbicha/server,xx621998xx/server,owncloud/core,xx621998xx/server,whitekiba/server,Ardinis/server,owncloud/core,pollopolea/core,pmattern/server,pmattern/server,pixelipo/server,Ardinis/server,cernbox/core