What

Update the mobile client build creation form to allow the selection of existing secrets that can be used instead of creating new ones every time we create a build.

Why

Currently the build creation form can create multiple resources (build config and 2 secrets) when it is created depending on the scenario, and these resources always have to be created/recreated with different names for every build created. This could potentially lead to multiple secrets that are the same, but also it currently causes some issues during creation where some of the resources get created, but others will fail.

How

We should change this to allow the selection of existing secrets, but if they do not exist, open a new modal view to allow the user to create a new secret. This flow can be seen in other forms such as the edit build view for example.