build: Publish to GitHub Packages

Because Jitpack can not sign artifacts.

build.gradle.kts

@@ -24,8 +24,14 @@ tasks {
 repositories {
     mavenCentral()
     mavenLocal()
-    maven { url = uri("https://jitpack.io") }
     google()
+    maven {
+        url = uri("https://maven.pkg.github.com/revanced/registry")
+        credentials {
+            username = project.findProperty("gpr.user") as String? ?: System.getenv("GITHUB_ACTOR")
+            password = project.findProperty("gpr.key") as String? ?: System.getenv("GITHUB_TOKEN")
+        }
+    }
 }
 
 dependencies {