Werk #11248: Agent bakery: Automatically build agents for created hosts

After creating a new host in the configuration, the agent baking process for the new host is triggered now. When multiple hosts are created at once, for example using the API or an import mechanism, one baking process is started for all of these hosts.

The process is started as a background job, just like when a bake process is started manually. With the single difference that the process only cares about the newly added hosts. You can see the process or result message when accessing the Agent Bakery page in your Configuration.

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