add firebase-tools (firebase cli)

[Vrtak-CZ]

It's required for using Firebase App Distribution.
https://firebase.google.com/products/app-distribution

Pull Request Checklist

Check/accept these:

• I've updated the version in the Dockerfile
• I've updated the CHANGELOG.md
• I've provided a link or explanation below which describes the changes in the tool itself

[viktorbenei]

LGTM 🤖 👍

[viktorbenei]

The usual concern with any preinstalled tool is whether they require the latest version of this tool to be available, cause if they do it’s usually not a good idea to preinstall the tool as that’ll only be updated once a week.

That said in this case we'll also have a Step for Firebase App Distribution which should be able to handle this case, when a newer version of the tool would be required and update the tool during the step's run.

[koral--]

According to Firebase CLI docs there is no strong requirement on having the latest version. It's only a good practice.
https://firebase.google.com/docs/cli#update-cli

[ghaabor]

@Vrtak-CZ please update the CHANGELOG.md file with the added tool and the version number accordingly in the Dockerfile

[viktorbenei]

I submitted our usual PR checklist to this repo #260

[Vrtak-CZ]

@Vrtak-CZ please update the CHANGELOG.md file with the added tool and the version number accordingly in the Dockerfile

Done

[viktorbenei]

Perfect, thank you @Vrtak-CZ ! :)

[viktorbenei]

Also thanks @koral-- for the infos ;)