Replace libimobiledevice with pymobiledevice3 in Docker images

docs/docker.md

@@ -1,6 +1,6 @@
 Using Docker simplifies running MVT with its dependencies readily installed. Note that this requires a Linux host, as Docker for Windows and Mac [doesn't support passing through USB devices](https://docs.docker.com/desktop/faqs/#can-i-pass-through-a-usb-device-to-a-container).
 
-For iOS acquisition, we recommend [installing pymobiledevice3](ios/install.md) on the host and [creating a backup](ios/backup/pymobiledevice3.md) before analyzing it with MVT. The Docker images currently include libimobiledevice, not pymobiledevice3.
+The main and iOS Docker images include pymobiledevice3 for [creating iOS backups](ios/backup/pymobiledevice3.md). You do not need to install it separately on the host. Older image tags may still include libimobiledevice instead; build from the updated source if pymobiledevice3 is unavailable.
 
 Install Docker following the [official documentation](https://docs.docker.com/get-docker/).
 
@@ -39,12 +39,31 @@ If a prompt is spawned successfully, you can close it with `exit`.
 
 On the Linux host, install and start [usbmuxd](https://github.com/libimobiledevice/usbmuxd), then connect and unlock the iOS device. The daemon exposes the device through the `/var/run/usbmuxd` socket.
 
-Bind that socket into the container to let MVT communicate with the device:
+Bind that socket into the container to let pymobiledevice3 communicate with the device. Also mount a local directory so acquired backups persist after the container exits:
 
 ```bash
-docker run -it \
+mkdir -p "$PWD/cases"
+docker run --rm -it \
     --mount type=bind,source=/var/run/usbmuxd,target=/var/run/usbmuxd \
+    --mount type=bind,source="$PWD/cases",target=/home/cases \
     ghcr.io/mvt-project/mvt
 ```
 
+Inside the container, verify connectivity:
+
+```bash
+pymobiledevice3 lockdown info
+```
+
+Accept the trust prompt on the unlocked device if requested. Then follow the [backup instructions](ios/backup/pymobiledevice3.md), using a destination under `/home/cases`, such as `/home/cases/backup`.
+
+The iOS-only image defaults to running `mvt-ios`. To use pymobiledevice3 instead, override its entrypoint:
+
+```bash
+docker run --rm -it \
+    --mount type=bind,source=/var/run/usbmuxd,target=/var/run/usbmuxd \
+    --entrypoint pymobiledevice3 \
+    ghcr.io/mvt-project/mvt:latest-ios lockdown info
+```
+
 If you built the image from source, replace `ghcr.io/mvt-project/mvt` with `mvt`.