docs(hub): add Raspberry Pi (pre-built image) install flavor

hub/SUMMARY.md

@@ -9,6 +9,7 @@
   * [🐋 Docker](alby-hub-flavors/docker.md)
   * [⚡ Umbrel, Start9, etc](alby-hub-flavors/umbrel-start9-etc.md)
   * [🐧 Linux](alby-hub-flavors/linux.md)
+  * [🍓 Raspberry Pi](alby-hub-flavors/raspberry-pi.md)
   * [🆙 Updating](alby-hub-flavors/updating.md)
   * [🤖 Using AI to Install Your Hub](alby-hub-flavors/using-ai-to-install-your-hub.md)
 * [👛 Wallet](wallet/README.md)

hub/alby-hub-flavors/raspberry-pi.md

@@ -0,0 +1,52 @@
+---
+description: Run Alby Hub at home on a Raspberry Pi using a ready-to-flash image.
+---
+
+# 🍓 Raspberry Pi
+
+Run Alby Hub on your own Raspberry Pi at home — your keys, your channels, on hardware you own. With the pre-built **Hub OS** image there's no command line and no manual install: flash the card, power on, and open your wallet in the browser.
+
+{% hint style="info" %}
+**Coming soon.** The ready-to-flash image and one-click Raspberry Pi Imager listing are being finalized. You can follow progress (and build it yourself) at [github.com/getAlby/hub-os](https://github.com/getAlby/hub-os).
+{% endhint %}
+
+## What you need
+
+* A **Raspberry Pi** — a **Pi Zero 2 W** (512 MB) is enough; a Pi 4 or 5 gives more headroom.
+* A **microSD card** (8 GB+). For an always-on wallet we recommend booting from a **USB SSD** instead — it's far more durable than an SD card for 24/7 use.
+* A **power supply** and a case. A starter **kit that includes a case** gives the nicest finished result (no bare board on your desk).
+
+{% hint style="warning" %}
+The **Pi Zero 2 W uses micro-USB power and mini-HDMI** (not USB-C / full-size HDMI). If you buy a kit, make sure the power supply and adapters match — Pi 4/5 accessories won't fit.
+{% endhint %}
+
+## Flash the image
+
+1. Download and open **[Raspberry Pi Imager](https://www.raspberrypi.com/software/)**.
+2. Choose **Alby Hub** as the operating system. _(While the image is in preview, load it via the Hub OS release/custom repo — see [hub-os](https://github.com/getAlby/hub-os).)_
+3. In Imager's settings (the gear icon), set your **Wi‑Fi network and password**, and choose a **hostname** (e.g. `albyhub`).
+4. Select your SD card (or SSD) and **write**.
+
+## First boot
+
+1. Insert the card into your Pi and power it on. The first boot takes **2–3 minutes**.
+2. Open **`http://albyhub.local`** in your browser.
+3. Set a password, **write down your seed phrase** (this is your wallet backup), and [open your first channel](../wallet/open-your-first-channel.md).
+
+That's it — you're running a self-custodial Lightning wallet on your own hardware.
+
+{% hint style="info" %}
+**Tip:** For long-term reliability, boot from a **USB SSD** rather than a microSD card, link your [Alby Account](../faq/why-do-i-need-to-link-my-alby-account.md) so your channel backups are stored encrypted, and use a quality power supply.
+{% endhint %}
+
+## Keeping it updated
+
+No SSH needed. The image applies **operating-system security updates
+automatically**, and checks for new **Alby Hub** versions weekly.
+
+To get Alby Hub updates fully hands-off, **enable auto-unlock** (Alby Hub →
+Settings). An update restarts the hub, so without auto-unlock it would come back
+locked — therefore auto-update only runs when auto-unlock is on. The trade-off:
+your unlock password is stored on the device, so keep your **seed phrase** safe
+as your real backup. With manual unlock, just update when the hub shows the
+**Update Available** banner.