Use FVM

[nilsreichardt]

Description

This PR introduces the use of FVM. FVM allows to us have a SOT of our Flutter version. Therefore, it's easier to keep the same Flutter version across different developers. Additionally, we can use in CI/CD the same Flutter version in every workflow.

Additional setup

The use of FVM require additionally setup steps for a new developer:

# Install FVM
dart pub global activate fvm

# Install Flutter version
fvm install

How to change the Flutter version

1. Change the version in .fvm/fvm_config.json
2. Run fvm install

Related Tickets

Closes #144

[nilsreichardt]

I will update the Flutter version in a seperate PR

[nilsreichardt]

Android Studio users need to set up FVM for themselves in Android Studio, because I think in Android Studio isn't something like settings.json which can commit to git (I think the .idea/workspace.xml contains also information about the local machine): https://fvm.app/docs/getting_started/configuration/#android-studio

[Jonas-Sander]

Thanks for the info, then we should add this to our setup documentation doc as well

[github-actions]

Visit the preview URL for this PR (updated for commit 59f8bea):

https://sharezone-test--pr146-fvm-bz5ljq0w.web.app

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[nilsreichardt]

@Jonas-Sander Are the setup steps part of the CONTRIBUTION.md (#28)?

[Jonas-Sander]

I guess so. If you create it then don't forget to link to it from the README.md

[Jonas-Sander]

LGTM, although I would like the setup documentation added via this PR as well

[nilsreichardt]

@Jonas-Sander I added a new section to CONTRIBUTIN.md. Is this enough documentation, or should we add more?

[Jonas-Sander]

@Jonas-Sander I added a new section to CONTRIBUTIN.md. Is this enough documentation, or should we add more?

LGTM like this