When using the AzureRmWebAppDeployment@4 task in yaml pipelines, the default is to run from a zip file, which sets WEBSITE_RUN_FROM_PACKAGE=1. This is fine for most cases, but Umbraco sites don’t work on a read only filesystem.

The secret setting

The pipelines Azure Web App Deployment Task input value enableCustomDeployment: true will stop pipelines from auto-detecting the best deployment method and use ‘webDeploy’.

This will unzip the files into App Service storage, and leave WEBSITE_RUN_FROM_PACKAGE unset, giving Umbraco write access to the filesystem, and allowing it to run.

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