Fast Lane is a deployment tool for app development. 

IOS and Android. 

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I use it commercially for flutter deployments. 

But it is not flutter specific and can be integrated with meny platforms.

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Watch this video from Youtube 

https://www.youtube.com/watch?v=scfOk5SgrKU

Initialize Fastlane for Flutter App

IOS and ANDROID

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Fastlane is a ruby gem. Install ruby on your machine first!!! Below Link ↓↓↓

// https://www.ruby-lang.org/en/documentation/installation/

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ANDROID ↓↓↓ // https://docs.fastlane.tools/getting-started/android/setup/

// Step 1 :

cd android

// Step 2 (Configure Setup) :

fastlane init

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IOS ↓↓↓ // https://docs.fastlane.tools/getting-started/ios/setup/

// Step 1 :

cd ios

// step 2 (Configure Setup) :

fastlane init