CreateBuildContext create a Docker build context using the provided function handler and language template.

MakeTar create a tar archive that contains the build config and build context.

NewFunctionBuilder create a new builder for building OpenFaaS functions using the Function Builder API.

WithBuildDir is an option to configure the directory the build context is created in.

WithHandlerOverlay is an option to configure the path where the function handler needs to be overlayed in the template.

WithHmacAuth configures the HMAC secret used to sign request payloads to the builder API.

WithTemplateDir is an option to configure the directory where the build template is looked up.