Add protobuf object: PITA

https://developer.android.com/topic/libraries/architecture/datastore#proto-datastore-dependencies

But getting gradle to generate the object is not documented anywhere correctly:
https://github.com/google/protobuf-gradle-plugin
protocolbuffers/protobuf#8062

app/build.gradle

@@ -1,6 +1,16 @@
+buildscript {
+    repositories {
+        gradlePluginPortal()
+    }
+    dependencies {
+        classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.19'
+    }
+}
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
+    id "com.google.protobuf" version "0.8.19"
 }
 
 android {
@@ -46,7 +56,6 @@ android {
 }
 
 dependencies {
-
     implementation 'androidx.core:core-ktx:1.7.0'
     implementation "androidx.compose.ui:ui:$compose_version"
     implementation "androidx.compose.material3:material3:1.0.0-alpha15"
@@ -60,4 +69,24 @@ dependencies {
     androidTestImplementation "androidx.compose.ui:ui-test-junit4:$compose_version"
     debugImplementation "androidx.compose.ui:ui-tooling:$compose_version"
     debugImplementation "androidx.compose.ui:ui-test-manifest:$compose_version"
+}
+
+protobuf {
+    protoc {
+        // You still need protoc like in the non-Android case
+        artifact = 'com.google.protobuf:protoc:3.21.5'
+    }
+    generateProtoTasks {
+        all().each { task ->
+            task.plugins {
+                java {
+                    option "lite"
+                }
+            }
+        }
+    }
+}
+
+dependencies {
+    implementation 'com.google.protobuf:protobuf-javalite:3.21.5'
 }

app/src/main/proto/test.proto

@@ -0,0 +1,10 @@
+syntax = "proto3";
+
+option java_package = "io.zeitmaschine.zimzync";
+option java_multiple_files = true;
+
+message Test {
+  string url = 1;
+  string key = 2;
+  string secret = 3;
+}