[ci skip] Add remote build cache configuration through Gradle properties (#12797)

settings.gradle.kts

@@ -1,5 +1,3 @@
-import java.util.Locale
-
 pluginManagement {
     repositories {
         gradlePluginPortal()
@@ -56,3 +54,27 @@ fun optionalInclude(name: String, op: (ProjectDescriptor.() -> Unit)? = null) {
         )
     }
 }
+
+if (providers.gradleProperty("paperBuildCacheEnabled").orNull.toBoolean()) {
+    val buildCacheUsername = providers.gradleProperty("paperBuildCacheUsername").orElse("").get()
+    val buildCachePassword = providers.gradleProperty("paperBuildCachePassword").orElse("").get()
+    if (buildCacheUsername.isBlank() || buildCachePassword.isBlank()) {
+        println("The Paper remote build cache is enabled, but no credentials were provided. Remote build cache will not be used.")
+    } else {
+        val buildCacheUrl = providers.gradleProperty("paperBuildCacheUrl")
+            .orElse("https://gradle-build-cache.papermc.io/")
+            .get()
+        val buildCachePush = providers.gradleProperty("paperBuildCachePush").orNull?.toBoolean()
+            ?: System.getProperty("CI").toBoolean()
+        buildCache {
+            remote<HttpBuildCache> {
+                url = uri(buildCacheUrl)
+                isPush = buildCachePush
+                credentials {
+                    username = buildCacheUsername
+                    password = buildCachePassword
+                }
+            }
+        }
+    }
+}