Mobile DevOps with GitLab, Part 2 - Code signing for Android with GitLab

What this post added

This post details the technical steps for generating an Android Keystore file using `keytool`, configuring `app/build.gradle` to use environment variables for signing configurations, and setting up CI variables in GitLab. It also provides a sample `.gitlab-ci.yml` file that uses the `glab` CLI to download secure files and execute the Android build process.