Support syft application configuration in the syft lib #4264
Description
What would you like to be added:
I'd like to be able to have an application that can respond to SYFT_ environment variables optionally when crafting a CreateSBOMConfig and any other capabilities at the top-level of the syft API.
This could encompass the full application configuration:
# if paths given, search for configs on disk at one or more paths, the first hit wins.
# if an environment access interface is given then override path values with those found from the env vars
syft.LoadConfig(paths []string, environment envInterface) *Config
syft.ConfigLocations() []string
... or could be limited to top-level api configs:
# exists today
syft.DefaultCreateSBOMConfig() *CreateSBOMConfig
# if paths given, search for configs on disk at one or more paths, the first hit wins.
# if an environment access interface is given then override path values with those found from the env vars
# use the default if nothing is found
syft.LoadCreateSBOMConfig(paths []string, environment envInterface) *CreateSBOMConfig
There are other options here
Why is this needed:
This allows for lib users to operate in environments that already have syft configured via environment variables seamlessly.
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