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Description
A useful pattern to support would be to allow multiple inputs to be combined into a single output. A canonical use case is combining a host and port stored in different config map entries (or different secrets) into a single URL. Similar patterns occur when configuring a database (host + utl + table name).
A proposed design might be something like:
combineValueFrom:
format: 'http://%s:%s'
inputs:
- getValueFrom:
....
- getValueFrom:
....The combineValueFrom takes a format which is expected to be a sprintf-style format string and a list of inputs, each of which is a fully-functional getValueFrom block (including format-transformers on the individual items).