For #1967 - Workflow to auto update Bitrise to latest Xcode stack available

[isabelrios]

trafficstars

This PR would fix #1967. It adds:

• a new workflow to detect new stacks on bitrise by running a cron job
• script to use the new stack detected on bitrise
• github action to automatically create a PR with the new xcode version
• build will run using that new stack so that we will know if the project builds or not with newest xcode

[isabelrios]

Example of PR created: https://github.com/isabelrios/focus-ios/pull/13

[mergify[bot]]

This pull request has conflicts when rebasing. Can you please fix it @isabelrios? 🙏

[mergify[bot]]

This pull request has conflicts when rebasing. Can you please fix it @isabelrios? 🙏

[isabelrios]

I need to fix the conflicts here before the review, sorry about that

[mergify[bot]]

This pull request has conflicts when rebasing. Can you please fix it @isabelrios? 🙏

[mergify[bot]]

This pull request has conflicts when rebasing. Can you please fix it @isabelrios? 🙏

[razvanlitianu]

@isabelrios is this pr still relevant?

[isabelrios]

@isabelrios is this pr still relevant?

I think it would be a good to have. With this PR landed, we will be able to pre-build the app with the newer xcode versions available in Bitrise. This will give us a heads up in case the app does not work/needs work with a certain xcode version before we move to it. I can work to fix the conflicts here

[isabelrios]

I would also need @jevans-mozilla's approval for the bitrise.yml changes. Thanks!

[mergify[bot]]

This pull request has conflicts when rebasing. Can you please fix it @isabelrios? 🙏

[isabelrios]

let's close this old PR