Bootstrap Arch on Raspberry Pi with only a Wifi dongle

Installing Arch on the Raspberry Pi is rather simple and well documented. There is an offline step, where you copy a base system on the SD card. Then, you place the card in the Raspberry Pi, boot it and you log into that new system somehow, to finish the configuration and start customizing. “Somehow” is either: you plug a keyboard and a screen to the Raspberry Pi and work within the console, or: you plug the Raspberry Pi to your router/computer through an Ethernet cable and log in over SSH. But what if all you have is a Wifi dongle?

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