Add fastlane for app stores

[PanderMusubi]

Please adr fastlane which is useful for publishing on Google Play but required for publishing on F-Droid, see https://gitlab.com/fdroid/rfp/-/issues/3231#note_2665149776

For example implementation, see #78

[codeman-crypto]

@PanderMusubi Thank you for your suggestion. We will look into It.

[PanderMusubi]

Created also issues for the other apps except https://github.com/Beldex-Coin/beldex-master-node-monitor as issues are not yet enabled. FYI Implementing fastlane is also beneficial when publishing on Google Play as it reduces manual actions to upload/upgrade screenshots etc.

[PanderMusubi]

See also:

• https://gitlab.com/-/snippets/1895688
• https://gitlab.com/IzzyOnDroid/repo/-/wikis/Fastlane