You don't need to keep the installed seeds in your repo, simply add this step and Bitrise will do the seed install for you on the VM!
Run CocoaSeeds install ($ seed install) in your App's directory.
$ seed install
This Step uses CocoaPods' pod install or pod update command to install your dependencies.
pod install
pod update
Runs yarn with the given command and args.
yarn
Install and Run Appium Server
Install or upgrade packages on Ubuntu with apt-get.