...
Source code - Mostly Git but can Liquibase Business projects can be checked into any source code provider (e.g. , TFS, SVN, etc.)
Build and deploy - Most common build tool is Jenkins but it can also easily integrate with other on-prem and cloud hosted tools, e.g., Bamboo, Azure DevOps, etc.
Artifacts repository - It is a common practice to use an artifacts repository such as Nexus or Artifactory to store versioned artifacts so that teams are always ready to deploy any version
Typical automation workflow
Initially, a user would create a new Liquibase Business project using the GUI and then check in the project into source code. It is typical to commit Liquibase Business project into the same repository as your SQL scripts.
Once the project is in source code, then the pipeline workflow would look like this:
Checkout repository
Deploy to DEV (first environment in the pipeline)
Create a versioned artifact
Deploy versioned artifact to TEST, STAGE or PROD
Pseudo Code
1. Checkout repository
...