build: Use Gradle credentials system

[validcube]

Switch to PasswordCredentials when during authentication with ghcr

nts:

githubPackagesUsername=
githubPackagesPassword=

List of what repository have PR submitted see: ReVanced/revanced-manager-downloader-template#16 (comment)

[Copilot]

Pull request overview

This PR modernizes the Gradle authentication system by switching from manually configured credentials to Gradle's built-in PasswordCredentials system for accessing GitHub Packages.

Key changes:

• Updated build.gradle.kts to use credentials(PasswordCredentials::class) instead of manual credential configuration
• Modified GitHub Actions workflows to use standardized Gradle project properties via environment variables
• Added repository name to enable proper credential discovery

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 4 comments.

File	Description
build.gradle.kts	Replaced manual credential configuration with PasswordCredentials system and added repository name
.github/workflows/release.yml	Updated environment variables to use ORG_GRADLE_PROJECT_ prefix for Gradle property injection
.github/workflows/build_pull_request.yml	Updated environment variables to use ORG_GRADLE_PROJECT_ prefix for Gradle property injection

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