Add overridable cacertfile

[easink]

Add a way to override CAStore.

[yonkeltron]

Hey I and my team (in a corporate environment) have run into an issue where we need to override the CAStore. As well as asking after the status of this feature, is there any info we can provide to help in building a use case? Perhaps we could even help test some stuff!

Thanks, +Jonathan

[seymores]

For anyone who is needing this patch;

#config/dev.ex or config/prod.ex
config :tailwind,
    cacerts_path: "/to/ssl/path/custom.pem"

[josevalim]

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