Fix Swiss CovidCert

Thore Göbelrequested to merge
thgoebel/fdroiddata:ch-covcert into master

This builds v2.7.0 of both the wallet and the verifier specifically for F-Droid.

We still have issues with F-Droid reproducing the main APKs distributed to the Play and AppGallery. So in the meantime we switch to releases just for F-Droid. The only difference between the main releases and the F-Droid releases are that main has minSdkVersion 23 while F-Droid has minSdkVersion 24. This seems to be enough for F-Droid to be able to reproduce it...

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