Pin version of firebase-tools used for deploys.

[mikelehen]

The use case you're trying to solve

Github deploys work reliably from day to day.

Change to the action that would solve that use case

Instead of installing the latest firebese-tools every time, pin to a version that is known to work correctly and only update it periodically. Perhaps allow developers to override the version if they choose.

Other considerations

For context, the firebase-tools@11.14.0 release had a regression that broke deploys for many firebase projects. firebase/firebase-tools#5071

I don't need my automatic deploys to be using the absolute latest version of firebase-tools. I'd rather it only update occasionally so that I'm not subject to surprise breakages.

[davideast]

Hey @mikelehen! I think adding a version override is more than a reasonable option for starters. I'll look into some options for improvement here and get back to you.

[aaronadamsCA]

+1 to pinning the dependency. I know it would require an action release every time the internal version was to be updated; but this would be correct, and would mirror the way other GitHub Actions generally work.

[drummerjolev]

+1, great idea @mikelehen

[mikelehen]

Awesome, thanks @davideast!

[jhuleatt]

Thanks for the feedback all! firebaseToolsVersion is now available as an option thanks to #246. For now, we're going to keep @latest as the default behavior.