Tweak the CI setup and build

[rock3r]

Problem

• We're running unit tests twice on the CI for no good reason
• FOSSA is shite
• We're running unit tests and Lint as part of the pre-push hook
• We're using an outdated Android CI image
• We're using an outdated Gradle version
• We have some fuckups in the Detekt setup

Solution

• Make the unit tests only run once on the CI
• Dump FOSSA
• Only run Detekt and ktlint in the hook
• Use the stable CI Docker image
• Update Gradle
• Fix the Detekt setup

Paired with

Nobody