Build: Make use of user & password properties in build cache configuration

dependencies/kotlin-build-gradle-plugin/build.gradle.kts

@@ -4,7 +4,7 @@ plugins {
 }
 
 group = "org.jetbrains.kotlin"
-version = "0.0.7"
+version = "0.0.8"
 
 repositories {
     mavenCentral()

dependencies/kotlin-build-gradle-plugin/src/BuildCache.kt

@@ -14,6 +14,10 @@ fun Settings.setupBuildCache() {
         buildCache.remote(HttpBuildCache::class.java) { remoteCache ->
             remoteCache.url = URI(remoteCacheUrl)
             remoteCache.isPush = kotlinBuildProperties.pushToBuildCache
+            if (kotlinBuildProperties.buildCacheUser != null && kotlinBuildProperties.buildCachePassword != null) {
+                remoteCache.credentials.username = kotlinBuildProperties.buildCacheUser
+                remoteCache.credentials.password = kotlinBuildProperties.buildCachePassword
+            }
         }
     }
 }