Feat: Allow user certificates so that self signed WebDAV can work

If someone is able to install a user CA into the system, they could
also just downgrade the WebDAV setting in this app to HTTP anyway.

Bug: #1187

app/src/main/AndroidManifest.xml

@@ -47,6 +47,7 @@
  android:fullBackupContent="true"
  android:icon="@mipmap/launcher_icon"
  android:label="@string/app_name"
+ android:networkSecurityConfig="@xml/netework_security_config"
  android:requestLegacyExternalStorage="true"
  android:requestRawExternalStorageAccess="true"
  android:resizeableActivity="true"

app/src/main/res/xml/netework_security_config.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+ ~ Copyright (c) 2024 Hai Zhang <[email protected]>
+ ~ All Rights Reserved.
+ -->
+
+<network-security-config
+ xmlns:tools="https://schemas.android.com/tools"
+ tools:ignore="AcceptsUserCertificates,InsecureBaseConfiguration">
+ <base-config cleartextTrafficPermitted="true">
+ <trust-anchors>
+ <certificates src="system" />
+ <certificates src="user" />
+ </trust-anchors>
+ </base-config>
+</network-security-config>