doc: Add a link to Android APK CI artifact to README and PR template

Author: hebasto

.github/PULL_REQUEST_TEMPLATE.md

@@ -45,6 +45,7 @@ patches often sit for a long time.
 <!--
 Links for Windows and macOS build artifacts. Replace <PR> with the assigned pull request number.
 
-[![Windows](https://svgshare.com/i/ZhY.svg)](https://api.cirrus-ci.com/v1/artifact/github/bitcoin-core/gui-qml/win64/insecure_win_gui.zip?branch=pull/<PR>)
-[![macOS](https://svgshare.com/i/ZjP.svg)](https://api.cirrus-ci.com/v1/artifact/github/bitcoin-core/gui-qml/macos/insecure_mac_gui.zip?branch=pull/<PR>)
+[![Windows](https://img.shields.io/badge/OS-Windows-green)](https://api.cirrus-ci.com/v1/artifact/github/bitcoin-core/gui-qml/win64/insecure_win_gui.zip?branch=pull/<PR>)
+[![macOS](https://img.shields.io/badge/OS-macOS-green)](https://api.cirrus-ci.com/v1/artifact/github/bitcoin-core/gui-qml/macos/insecure_mac_gui.zip?branch=pull/<PR>)
+[![Android](https://img.shields.io/badge/OS-Android-green)](https://api.cirrus-ci.com/v1/artifact/github/bitcoin-core/gui-qml/android/insecure_android_apk.zip?branch=pull/<PR>)
 -->

src/qml/README.md

@@ -5,6 +5,7 @@
 To test the recent GUI from the main branch, insecure CI artifacts can be used:
 - for Windows: [`insecure_win_gui.zip`](https://api.cirrus-ci.com/v1/artifact/github/bitcoin-core/gui-qml/win64/insecure_win_gui.zip)
 - for macOS: [`insecure_mac_gui.zip`](https://api.cirrus-ci.com/v1/artifact/github/bitcoin-core/gui-qml/macos/insecure_mac_gui.zip)
+- for Android: [`insecure_android_apk.zip`](https://api.cirrus-ci.com/v1/artifact/github/bitcoin-core/gui-qml/android/insecure_android_apk.zip)
 
 This directory contains the source code for an experimental Bitcoin Core graphical user interface (GUI) built using the [Qt Quick](https://doc.qt.io/qt-5/qtquick-index.html) framework.