because the url changed from:
https://firefox-ci-tc.services.mozilla.com/api/index/v1/task/mobile.v2.fenix.production.latest.arm64-v8a/artifacts/public/build/arm64-v8a/geckoBeta/target.apk
to:
https://firefox-ci-tc.services.mozilla.com/api/index/v1/task/mobile.v2.fenix.production.latest.arm64-v8a/artifacts/public/build/arm64-v8a/geckoNightly/target.apk
because the url changed from:
https://firefox-ci-tc.services.mozilla.com/api/index/v1/task/mobile.v2.fenix.production.latest.arm64-v8a/artifacts/public/build/arm64-v8a/geckoBeta/target.apk
to:
https://firefox-ci-tc.services.mozilla.com/api/index/v1/task/mobile.v2.fenix.production.latest.arm64-v8a/artifacts/public/build/arm64-v8a/geckoNightly/target.apk
b71610531a
Released new version - but I don't know when it will be available on F-Droid
is fixed