How to deploy a package to using codemagic.yaml

In order to get publishing permissions, first, you will need to log in to locally. It can be done by running pub publish --dry-run. After that, credentials.json will be generated, which you can use to log in without the need for Google confirmation through the browser.

credentials.json can be found in the pub cache directory (~/.pub-cache/credentials.json on MacOS and Linux, %APPDATA%\Pub\Cache\credentials.json on Windows)

- echo $CREDENTIALS | base64 --decode > "$FLUTTER_ROOT/.pub-cache/credentials.json"
- flutter pub publish --dry-run
- flutter pub publish -f