Generally available: Static Web Apps support for stable URLs for preview environments
When you deploy a site to Azure Static Web Apps, each pull request against your production branch will generate a preview deployment available at a temporary URL. This can be configured in the GitHub Actions workflow by enabling deployment from branches or by specifying a deployment environment name.
To deploy non-production branches to a preview environment, you are required to update the GitHub workflow to run when a push is made to the specific branches and define the production_branch property in the build_and_deploy_job configuration.
Alternatively, you can push changes to a named preview environment by configuring a deployment_environment property in the workflow.
Source: Generally available: Static Web Apps support for stable URLs for preview environments