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 pull request modernizes the Gradle authentication mechanism by switching from manual credential configuration to Gradle's built-in PasswordCredentials system for GitHub Packages authentication. The changes standardize how credentials are passed from CI/CD workflows to the Gradle build.

Key changes:

• Replaced manual username/password assignment in build.gradle.kts with PasswordCredentials system
• Updated GitHub Actions workflows to use Gradle project properties via environment variables
• Added repository name to enable Gradle's credential lookup mechanism

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 5 comments.

File	Description
build.gradle.kts	Simplified credentials configuration by using PasswordCredentials class and added repository name for credential lookup
.github/workflows/release.yml	Updated environment variables to use Gradle project property naming convention for credentials
.github/workflows/build_pull_request.yml	Updated environment variables to use Gradle project property naming convention for credentials

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