refactor: gradle build script

build.gradle.kts

@@ -1,24 +1,21 @@
 plugins {
-    kotlin("jvm") version "1.6.21"
+    kotlin("jvm") version "1.7.0"
     java
     `maven-publish`
 }
 
 group = "app.revanced"
 
+val githubUsername: String = project.findProperty("gpr.user") as? String ?: System.getenv("GITHUB_ACTOR")
+val githubPassword: String = project.findProperty("gpr.key") as? String ?: System.getenv("GITHUB_TOKEN")
+
 repositories {
     mavenCentral()
     maven {
         url = uri("https://maven.pkg.github.com/revanced/multidexlib2")
         credentials {
-            // DO NOT set these variables in the project's gradle.properties.
-            // Instead, you should set them in:
-            // Windows: %homepath%\.gradle\gradle.properties
-            // Linux: ~/.gradle/gradle.properties
-            username =
-                project.findProperty("gpr.user") as String? ?: System.getenv("GITHUB_ACTOR") // DO NOT CHANGE!
-            password =
-                project.findProperty("gpr.key") as String? ?: System.getenv("GITHUB_TOKEN") // DO NOT CHANGE!
+            username = githubUsername
+            password = githubPassword
         }
     }
 }
@@ -32,8 +29,7 @@ dependencies {
     api("org.smali:smali:2.5.2")
 
     testImplementation(kotlin("test"))
-    implementation(kotlin("reflect"))
-}
+    implementation(kotlin("reflect"))}
 
 tasks {
     test {
@@ -49,11 +45,8 @@ java {
     withJavadocJar()
 }
 
-val isGitHubCI = System.getenv("GITHUB_ACTOR") != null
-
 publishing {
     repositories {
-        if (isGitHubCI) {
             maven {
                 name = "GitHubPackages"
                 url = uri("https://maven.pkg.github.com/revanced/revanced-patcher")
@@ -62,9 +55,6 @@ publishing {
                     password = System.getenv("GITHUB_TOKEN")
                 }
             }
-        } else {
-            mavenLocal()
-        }
     }
     publications {
         register<MavenPublication>("gpr") {