If you're actively developing the app, you should join the alpha channel so that when we make an alpha release you get it on your normal devices you use daily. This means you'll see any regressions we have, so you can help find and fix them before they go out wider. :-)
(If you'd like to help but aren't closely following development each day, please join the beta! And then give feedback and report issues, either in the repo or in chat. The beta is nearly as fresh as the alpha but somewhat more stable.)
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Android: A maintainer will add you to the list, and then give you a link you'll use to confirm. (Maintainer: look for "manage internal test" in the Play Console.)
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iOS: A maintainer will send you an invite to join App Store Connect. Then after you join, there's a second step to join the list of users that get alpha updates. (Maintainer: that list is confusingly labeled in the UI as simply "App Store Connect Users" -- don't be fooled. Confirm the person is on it; if not, see the plus-sign icon next to the inner heading, which lets you send an invite for that step.)