Azure App Service is a service used to create and deploy scalable, mission-critical web apps.
@Julian Vicaria, Francisco Jose , Are you leveraging Azure App Service on Linux? are you referring to any steps in the Azure docs?
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On Azure App Service uses the Docker container technology to host both built-in images and custom images.
Run the Azure CLI command, 'az webapp list-runtimes --linux'. - To see a list of built-in images
The sample app used in this tutorial already has the necessary configuration in the Dockerfile, which installs the SSH server.
You can add dockerfile as outlined in this doc - Migrate custom software to Azure App Service using a custom container