If you have tests that need to exercise Blob, Queue or Table storage from Azure Storage, you can use Azurite (v3) in CI, which can be configured for GitHub Actions as follows:
- name: ⚙ azurite
npm install azurite
npx azurite-table &
The first line will install it, and the second will start it in a background process. Tests will need to use CloudStorageAccount.DevelopmentStorageAccount to access the locally running instance automatically. Note that this is compatible with the older Azure Storage Emulator included with the Azure SDK with Visual Studio, so no changes are needed between local test runs and CI.