Continuous deployment scripts

[roryf]

Description

Adds GitHub actions to continuously upload Expo Go previews on merge to main, and automatic app store builds on release tags.

Probably needs more doc updates.

Branched from #205, also really needs #206 before we can actually submit for release in order to disable in progress features.

Type of change

• New Feature (non-breaking change which adds functionality)

Testing locally

Tested on GitHub Actions by adding this branch:

• https://github.com/Scottish-Tech-Army/Volunteer-app/actions/runs/6985621168/job/19010086816 (cancelled as it was waiting for build on EAS, fixed now via --no-wait
• https://github.com/Scottish-Tech-Army/Volunteer-app/actions/runs/6985728892/job/19010342226

Checklist

• [] My code follows the style guidelines of this project
• [] I have performed a self-review of my own code
• [] I have commented my code, particularly in hard-to-understand areas
• [] I have removed any unnecessary comments or console logging
• [] I have made corresponding changes to the documentation (if required)
• [] I have addressed accessibility, if needed
• [] I have followed best practices, e.g. NativeBase approaches and theming
• [] I have checked the app in dark mode, if making front-end design changes
• [] My changes generate no new warnings
• [] I have added tests that prove my fix is effective or that my feature works
• [] New and existing unit tests pass locally with my changes
• [] ~I have updated the version numbers in package.json files in the app and/or api directories as needed`

[M4RC1N76]

Thanks for your help @DougieWougie !! Great work @roryf !!