Dynamically Control Matrix of Jobs in GitHub Actions Based on Input Parameter Value

 We can use matrix in GitHub Actions to use a single defnition of job to create multiple jobs as described here in the documentation. Let's say we input the list of application names we want to build, as an input parameter to the action workflow, and need to have the ability to remove the items from the app list at the time of triggering it manually (run workflow). For example, we have 4 apps by default. However, when we need we should be able to build only one or two out of them using the same action workflow without having to change, the workflow defintion. In this post let's explore how we can achieve that with GitHub actions workflow, utilizing the matrix strategy, and dynamical setting the matrix value.