My favorite use of a Raspberry Pi has been to run a Jenkins instance. I use it for CI/CD on projects, but also for automating other tasks -- You can use Jenkin

My favorite use of a Raspberry Pi has been to run a Jenkins instance. I use it for CI/CD on projects, but also for automating other tasks -- You can use Jenkins to wrap any arbitrary script with more higher-level logic and extensibility than a cron job. For example, I use Jenkins to automate multiplatform builds for some side projects, to periodically ingest data into a database, perform cleanup jobs, etc.