How to use your Protonmail account with Geary on your Pinephone (Mobian, in this case)

In order to use a Protonmail account with an app like Geary that uses IMAP and SMTP, you need to use the Protonmail Bridge application. This is not a problem on your x86 desktop, however on an ARM64 device like the Pinephone, there is no Protonmail Bridge binary available. Instead, we will be using a third-party open-source bridge application called Hydroxide. In order to use it, we will have to