Tutorial: Android CI/CD with GitLab

What this post added

This post details the setup of an automated CI/CD pipeline for Android applications using GitLab and fastlane. It covers the installation and initialization of fastlane, the creation and configuration of keystores and properties files for code signing, and the upload of these sensitive files to GitLab's Secure Files. It also outlines the necessary configurations in Gradle and the `.gitlab-ci.yml` file to integrate with the Google Play Console, including creating a Google service account and enabling the integration. The post provides a reference project and specific commands for building and uploading the app.