* add tokens to replace in release pipeline for metainfo release dates/versions
* validate the metainfo in pipeline
* install appstream first
* release notes in the metainfo
* release notes for metainfo - testing pipeline
* pipeline works
* brand colors as per flathub recommendation
* picked colours following flathubs recommendations
* contrast
* contrast checked
* updating nightly flow to also work with new metainfo for testing
* replacing manifest info and creating pr
* minor improvements
* release notes
* upgrade action
* make it easier to download the desktop app artifacts
* release notes
* naming the artifacts *.zip becuase zips are mandatory
* Revert "naming the artifacts *.zip becuase zips are mandatory"
This reverts commit 02f9fcaa69.
