we push a new template version on eachcoder templates push invokation despite the template being unchanged.coder templates push is an abstraction around:

1. uploading a tar file
2. creating a template version that references that tar file
3. getting all the required parameter values for that tar file

despite a new template version being created each time, the hash stays the same. we should check the existing version hash against the hash for the new template version and run a no-op if they are the same.