[docker:android-sdk] Rebuild android-sdk image. Remove patcher dependency and update readme

Author: jush

Diff for: README.md

@@ -8,7 +8,11 @@ This repository contains Docker files for running [Mapbox GL](https://github.com
 
 ### Adding a new image
 
-When you want to add a new image, e.g. a new compiler version or a new Android NDK version, duplicate an existing file in the `images` directory, annd change it to suit your needs. There's usually no need to keep previous versions of e.g. the Android NDK around. Legacy branches of mapbox-gl-native will use legacy Docker images that contain the legacy NDKs.
+When you want to add a new image, e.g. a new compiler version or a new Android NDK version, duplicate an existing file in the `images` directory, and change it to suit your needs. There's usually no need to keep previous versions of e.g. the Android NDK around. Legacy branches of mapbox-gl-native will use legacy Docker images that contain the legacy NDKs.
+
+### Updating a new image
+
+When you want to update an existing image, e.g. update dependencies, new feature, edit an existing file in the `images` directory, and change it to suit your needs. If the image you're modifying serves as a base for other images you also need to build the derived images, for example [PR#88](https://github.com/mapbox/mbgl-ci-images/pull/88).
 
 ### Workflow
 

Diff for: images/android-sdk

@@ -23,7 +23,6 @@ RUN set -eu \
         "platforms;android-33" \
         "platforms;android-34" \
         "extras;android;m2repository" \
-        "patcher;v4" \
         "extras;google;m2repository" \
         "extras;m2repository;com;android;support;constraint;constraint-layout;1.0.2" \
         "cmake;3.22.1" \